一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形，且底面边长与各侧棱长相等，这个三棱锥的底面边长与各侧棱长也都相等．设四棱锥、三棱锥、三棱柱的高分别为
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，
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A． |
B． |
C． |
D． |
国际文化交流中心将组织一次由各国学生参加的“和平·友谊”夏利营活动，假设你是李华，从报纸上看到此消息，想参加夏利营，请根据下列有关信息写一篇个人简介。
| 姓名：李华 |
性别：男 |
| 年龄：18 |
学校：昆明一中 |
| 其他：爱好音乐、摄影；善于与人交流，乐于助人；热爱自然；热爱和平 |
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| 参加夏令营的目的：结交朋友，了解外国文化 |
注意：1．词数120左右；开头已给出，不计入总词数。
2．可根据内容要点适当增加细节，以使行文连贯。
I happened to read in the paper about your summer camp a couple of days ago, which is hy I’m now writing to you to present myself for the camp．
此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾（√）。如有错误（每行只有一个错误），则按下列情况改正：此行多一个词：把多余的词用斜线（\）划掉，在右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下面划一横线，在该行右边横线上写出改正后的词。
Working in a international company in New York, Bill used
to go to the barber's during working hours to have his hair
cut, which, of course,∧against the rule: Office workers had to
have their hair cut in their own times．While Bill was at
the barber's one day, the manager came in by the accident to
have his own hair cut．Bill tried to hide his face immediate
he saw the manager, but the manager recognized himself．When
asking why he was having his hair cut in office time,
Bill said calmly, “It grows in office time.” “No all of it,”
said the manager．“Some of it grow in your own time.”
“But I am not having it all cut off.” Bill replied.
There is a joke among flu researchers: “If you've seen one flu season, you've seen one flu season.” The joke is about the unpredictable nature of the flu virus．Every year it looks different, and every strain (类型) follows its own pattern — it's the reason why new strains like H1N1 are extremely difficult to predict.
Dr．Michael Osterholm is a former adviser to the U.S．Department of Health and Human Services．“I know less about influenza today than I did 10 years ago,” he says in a joking way．“Every stone we've turned over, we get more questions.”
The flu rectums every season and the world experiences terrible pandemics (全国或全世界范围流行的疾病), but researchers still do not understand why some strains infect people and others do not; they are not entirely sure about how the flu is transmitted; nor do they understand why some patients become seriously ill while others develop mild symptoms (症状)．As a result, when a new strain shows up — like H1N1 — they often have little information to fall back on, and the lessons of previous pandemics are only somewhat helpful．While researchers are still putting together a complete picture of H1N1, for example, its most striking difference with the seasonal flu is that the elder1y are not the most vulnerable (易受攻击的) population.
Influenza's unpredictable nature makes it a moving target for researchers, says researcher Allison Aiello
at the University of Michigan．“Even if we had complete seasonal flu data from the past, it wouldn't be much helpful for a new strain of influenza,” she explains.
Whi1e researchers are frustrated by the holes in their knowledge, they say, however, that the pub1ic--health community is generally doing a very good job responding to H1N1 with seasonal flu data that do exist．Studying influenza, says Osterholm, is “like looking through the windows of a house you can't get into because the door is locked.” Gathering the data researchers do have is like “looking through the windows to get a pretty good picture of what the inside looks like.”
One thing researchers do know for sure: the best way for people to protect against H1N1 is to get the vaccine once it becomes available to them.What do we learn about H1N1 from the passage?
| A．In fact it is not a kind of influenza virus. |
| B．It is quite possible to predict it in theory. |
| C．Old people are more likely to contract it than kids. |
| D．Receiving vaccines will be effective to protect against it. |
The underlined phrase
“fall back on” in Para．3 probably means .
| A．rely on | B．pass on | C．col1ect | D．exchange |
What do we know about p
revious seasonal flu data?
| A．It is useless to study them. |
| B．It is still necessary to study them. |
| C．They are misleading most of the time. |
| D．They are much more helpful than expected. |
Which of the following could be the best title for the passage?
| A．Outbreaks of the flu | B．Symptoms of the flu |
| C．Mysteries of the flu | D．Risks of the flu |
Rare birds in the UK have been living far better than the more common birds over the last decade due to the efforts of conservation organisations, according to a new assessment．
The research shows 
almost 60% of the 63 rare birds that live in the UK have increased over the last 10 years.
By contrast, only about one third of common species have increased over the same period．Just 28% of rare birds have decreased over the same period, compared with four out of every 10 common birds．The rare birds described in the assessment with increasing populations include the osprey (鹗) and corncrake (秧鸡)．All of these birds are subject to conservation action.
The declining common birds include the nightingale, swift (雨燕), house sparrow and red grouse (苏格兰雷鸟)．These are suffering declines for a variety of reasons, including changes in farming practices.
Dr David Noble, from the British Trust for Ornithology, said: “That some of our rarer birds have responded to targeted conservation action is great news．It shows just what can be achieved．What we need to do now is to continue the good work and use some of the lessons we have learned to help our more common birds.”
Dr Mark Avery, the conservation director of the Royal Society for the Protection of Birds (RSPB), said: “Over the last decade we've enjoyed some great conservation successes, including removing some threatened species from the World Conservation Union's Red List of Thratened Animals and increasing the populations of red kite, osprey, etc．However, these successes are countered (抵消) by continued declines of some widespread species.”
The overview of 210 native birds has been produced by a group of conservation organisations, to mark the publication of The State of the UK's Birds report, which is in its l0th year．The report was published by the RSPB for a group of conservation organisations.Which of the following is TRUE according to the passage?
| A．The decline of widespread birds is not worrying for the UK. |
| B．The UK has got some practical experience of bird conservation. |
| C．Changes in farming practices contribute to the increase of rare birds. |
| D．Half of common birds have decreased in the past ten years in the UK. |
We can learn from the passage that Dr David Noble .
| A．hopes that conservation organisations will change the way they work |
| B．is quite disappointed with the result of the new assessment |
C．is losing confide nce in conservation organizations’ action |
| D．has high hopes for the increase in bird population in Britain |
Which of the following can best explain Dr Mark Avery's words?
| A．The UK should not be satisfied with what they have achieved. |
| B．The UK should share their experience with other countries. |
| C．What conservation organisations do is far from satisfactory. |
| D．The RSPB is responsible for the decrease of common birds. |
The passage is most likely to be found in a book about .
| A．popular science | B．historical events |
| C．nature | D．society |
The author's purpose of writing this article is to tell people .
| A．some good ways to protect rare birds |
| B．the differences between rare birds and common birds |
| C．the number of rare birds has increased over the last decade |
| D．some widespread birds in the UK are in great need of help |
Hummingbirds have got their name from the distinct “hum” sound made by their rapidly flapping (拍打) wings．The size of the bird decides the number of flaps it can do．The average lifetime of a hummingbird is 3 or 4 years, but some of them have lived beyond 12 years also．They are unique in many ways．Besides th
e number of rapid flaps they can do per second, they can also fly backwards.
Hummingbirds have an amazing sense of assessing the amount of sugar in the nectar (花蜜) they eat．They feed on the nectar of flowers．Hummingbirds do not feed on flowers whose nectar contains less than 10% sugar．Talk about a sweet tooth! As they cannot sustain themselves on nectar alone because of its poor nutritional value, they also feed on insects and spiders, and hummingbird food mixture that one can make at home.
Attracting hummingbirds to your garden will require a little planning．Plant butterfly bush, mimosa, coral bells, foxglove, morning glory, etc．These flowers attract the hummingbirds due to their high visibility (可见性) and nectar production．Avoid using pesticides (杀虫剂), as it will not only kill the insects around the flowers, but hurt the hummingbirds as well.
A common food for these birds is the sweettasting sugar syrup (糖浆)．Hummingbird food ingredients are just two: sugar and water．Take a large clean bowl, pour in it four cups of hot water, and dissolve one cup of table sugar in it．Stir slowly until all sugar has dissolved．
Hummingbirds, tiny as they are, collect a lot of nutrition．Providing them with hummingbird food mixture made of sugar water is a sure way to get all these beauties humming in your garden.Hummingbirds will have some little animals for their meal when .
| A．they can't find any green plants |
| B．they can't take in enough nutrition |
| C．they are bored with eating nectar |
| D．they are too old to fly |
In order to attract hummingbirds, you should .
| A．plan high trees |
| B．grow plants with small flowers |
| C．grow plants whose flowers are bright in color |
| D．grow plants coming into flower in the morning |
The main idea of the fourth paragraph is .
| A．how to prepare food for hummingbirds |
| B．where hummingbirds can find delicious food |
| C．hummingbirds can't live for long without sugar |
| D．hummingbirds like manmade food better than nectar |
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