轻松寒假，快乐复习30天 第12天
—How did he break his head while swimming?
— my warnings, he dived straight into the shallow water.
| A．To ignore | B．Ignored |
| C．Ignoring | D．Being ignored |
When he came back, he found his bag over the seat.
| A．hanging | B．to hang |
| C．hung | D．being hung |
I send you my revised catalogue and price list, ______ you may find something that suits you.
| A．to hope | B．hoping |
| C．hoped | D．hope |
The school had promised to keep parents fully _____ about the conditions of their children at school.
| A．inform | B．informing |
| C．informed | D．being informed |
______ the instructions very carefully when filling in the form.
| A．Following | B．To follow |
| C．Follow | D．Followed |
He can’t tolerate by her again and again during the report, so they quarreled at last.
| A．interrupting | B．to be interrupted |
| C．being interrupted | D．to interrupt |
—Have you finished your homework?
—Not yet. Now I regret the whole afternoon surfing on the Internet.
| A．wasting | B．in wasting |
| C．to waste | D．to be wasting |
that the country leaders can lead them out of the financial problems, people are becoming more optimistic about the future of the country.
| A．Convincing | B．Having convinced |
| C．To convince | D．Convinced |
Research found that children who drank mainly soda were more than twice as likely as those who drank no soda _________ signs of aggression.
| A．showing | B．shown |
| C．to show | D．show |
Drivers are warned that it is dangerous to talk on the phone while________.
| A．drive | B．driving |
| C．drove | D．to drive |
My husband, Tom, has always been good with animals, but I was still amazed when he befriended a female grouse (松鸡). It's for a grouse to have any contact (接触) with people. In fact, they're hard to spot, they usually fly off when they hear humans approaching.
This grouse came into our lives in Tom was working out in the field when he her walking around at the edge of the field. She was unafraid and seemed to be about what he was doing.
Tom saw the bird several times, and she got more comfortable around him. We quickly grew of the bird and decided to call her Mildred.
One day, as Tom was working, Mildred came within a few feet of him to watch. Tom he didn't see her and kept working to see what she would do next.
Apparently, she didn't like to be . She'd run up and peck (啄) at Tom's hands, then off to see what he would do. This went on for about 20 minutes, until Mildred became tired of the and left.
As spring went and summer came, Mildred started to more and more often. Mildred felt comfortable enough to jump up on Tom's leg and stay long enough for me to get a of the two of them together. This friendly grouse soon felt not just with our family, but with anybody who walked or drove by.
When hunting season opened, we put a at the end of our driveway asking not to shoot our pet grouse. My father, who lived down the road, warned people not to shoot her. . hunters would stop and take pictures, because they had never seen anything like her.
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However wealthy we may be, we can never find enough hours in the day to do everything we want. Economics deals with this problem through the concept of opportunity cost, which simply refers to whether someone’s time or money could be better spent on something else.
Every hour of our time has a value. For every hour we work at one job we could quite easily be doing another, or be sleeping or watching a film. Each of these options has a different opportunity cost—namely, what they cost us in missed opportunities.
Say you intend to watch a football match but the tickets are expensive and it will take you a couple of hours to get to and from the stadium. Why not, you might reason, watch the game from home and use the leftover money and time to have dinner with friends? This—the alternative use of your cash and time—is the opportunity cost.
For economists, every decision is made by knowledge of what one must forgo—in terms of money and enjoyment—in order to take it up. By knowing precisely what you are receiving and what you are missing out on, you ought to be able to make better-informed, more reasonable decisions. Consider that most famous economic rule of all: there’s no such thing as a free lunch. Even if someone offers to take you out to lunch for free, the time you will spend in the restaurant still costs you something in terms of forgone opportunities.
Some people find the idea of opportunity cost extremely discouraging: imagine spending your entire life calculating whether your time would be better spent elsewhere doing something more profitable or enjoyable. Yet, in a sense it’s human nature to do precisely that—we assess the advantages and disadvantages of decisions all the time.
In the business world, a popular phrase is “value for money.” People want their cash to go as far as possible. However, another is fast obtaining an advantage: “value for time.” The biggest restriction on our resources is the number of hours we can devote to something, so we look to maximize the return we get on our investment of time. By reading this passage you are giving over a bit of your time which could be spent doing other activities, such as sleeping and eating. In return, however, this passage will help you to think like an economist, closely considering the opportunity cost of each of your decisions.According to the passage, the concept of “opportunity cost” is applied to ________.
| A．making more money |
| B．taking more opportunities |
| C．reducing missed opportunities |
| D．weighing the choice of opportunities |
The “leftover ... time” in Paragraph 3 probably refers to the time ________.
| A．spared for watching the match at home |
| B．taken to have dinner with friends |
| C．spent on the way to and from the match |
| D．saved from not going to watch the match |
What are forgone opportunities?
| A．Opportunities you forget in decision-making. |
| B．Opportunities you give up for better ones. |
| C．Opportunities you miss accidentally. |
| D．Opportunities you make up for. |
1972年联合国在瑞典的斯德哥尔摩召开了有113个国家参加的联合国人类环境会议。会议讨论了保护全球环境的行动计划，通过了《人类环境宣言》。并将6月5日定为世界环境日，以唤起全世界人民都来注意保护人类赖以生存的环境，自觉采取行动参与全球的环境保护。为此联合国教科文组织就如何处理垃圾问题向全世界中学生征文。
请你以Saving Our City为题，写一篇150词左右的短文。文章包含以下几点:
1. 城市垃圾的危害：
①污染环境；
②有害健康。
2. 处理垃圾的措施有：
①垃圾分类；
②报纸、玻璃的等回收再利用；
③有害垃圾的处理；
④废水处理；
⑤制定法律。
作为一名中学生你该如何做……
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Your sincerely,
Li Hua
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