They eat wild animals，plants，berries，nuts，and insects.They hunt with bows and arrows.There are lots of dangerous snakes and spiders.It's one of southern Africa's
（1） （hot） places，and there is often no water.Then they have to get water from plant（2） they are ill，there are no hospitals.The people have to get medicine from plants too.
They are the San，（3） last people living in the Kalahari.The San people have another name-"bush people".（4） （they） lifestyle is very simple，but they know more about animals and plants than most people do.The San people live in small groups of 25﹣ 50.They live in huts-little "houses".These houses（5） （make）of wood and grass.There are no schools for the children.Children learn from the older people in the group.There are lots of things they have to learn so that they can live（6） a dangerous place like the Kalahari.In the evenings，the group of people often sit around a fire and tell stories.
The Kalahari is a big area of bushland in the southern Africa.It（7） （have）two parts.There is less rain in the southern part than in the northern part，（8） the south is drier.There are fewer plants and animals there，and it's more difficult for people
（9） （live）.But when it rains at the end of the summer，the land becomes greener and more beautiful.For a few weeks，there are（10） （million）of little flowers and even butterflies!
用方框中所给单词的适当形式填空，使短文完整、通顺。每词限用一次。
be; post; science; other; surprise; see; while; one; anything; we |
What color is a tennis ball? Ask your classmates, and they might give you some ___（1）___ answers.
The Atlantic asked 30, 000 people this question. Among the people surveyed, 52 percent said tennis balls are green, 42 percent said yellow, and 6 percent said ___（2）___ else.
According to the International Tennis Federation, tennis balls ___（3）___ yellow. So, why do most people say that they’re green?
When we ___（4）___ see an object in natural light, our brains recognize its true color. Even if the object ___（5）___ in different kinds of light later, our brains can still tell its true color. ___（6）___ call this color constancy (色彩恒常性). For example, we know that China’s flag is red. When we see it during sunset or under purple light, we still know that it is red, even if it looks like a different color.
However, the color of a tennis ball is not as pure (纯的) as the flag. It appears to be a mixture of yellow, a “warm” color, and green, a “cool” color.
The US-based magazine says that when ___（7）___ brains try to figure out what color the ball is, some people ignore (忽略) cool colors like green, blue and purple. So they see the ball as yellow. ___（8）___ ignore warm colors, such as red, yellow and orange. They see the ball as green.
It is not just tennis balls that make such confusion. In 2015, a girl ___（9）___ a picture of a dress online. Some people said the dress was black and blue ___（10）___ other people said it was gold and white. They had different opinions based on whether they ignored cool or warm colors.
Different activities were held to celebrate the ________ birthday of the Communist Youth League of China last month. （hundred）
Because COVID-19 hasn’t gone away, wearing masks （口罩） in public is a good way to look after ________ and the people around us. （we）
粤公网安备 44130202000953号