问题
单项选择题
让3岁左右的幼儿跨过前面的一条线，他往往踏在线上了，这是因为（）。
A.距离知觉发展不完善
B.观察的持续性不够
C.形状知觉发展不完善
D.视力较弱
答案
参考答案：A
解析：
3岁左右的幼儿，距离知觉发展还不完善。此时的孩子在走路时，让他跨过前面的一条线，因为把握不准其距离，所以往往踏在线上了。
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让3岁左右的幼儿跨过前面的一条线，他往往踏在线上了，这是因为（）。
A.距离知觉发展不完善
B.观察的持续性不够
C.形状知觉发展不完善
D.视力较弱
参考答案：A
解析：
3岁左右的幼儿，距离知觉发展还不完善。此时的孩子在走路时，让他跨过前面的一条线，因为把握不准其距离，所以往往踏在线上了。
The earth is our home. We must take care of it. Life today is easier than it was years ago, but it has brought some new problems. One of the biggest problems is pollution（污染）. We can see it, smell it, drink it and even it. Man has polluted the . The more people, the more pollution.Many years ago, the problem was not so serious because there were not so people. When the land was used up (用光), the river was not clean in a place,man went to place. Now man is slowly polluting the whole world pollution is still the most serious, it’s bad for things in the world.Many countries don’t le t people burn for air in houses and factories in the city. Pollution by SO2 is now the most dangerous kind of pollution. It’s caused by heavy traffic. People say it’s to ride bikes. When you are , there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s not bikes are expen sive or people are tired if they ride to work. It’s because the number of cars on the roads becomes larger. So more people their bikes and go to work by cars, then things are getting . We should have special roads only for bikes and make it difficult and expensive for drivers to take their cars into the city that they will go back to use their bikes.
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