Now,scientists still don't really know______．
A. whether animals can think about the past and the future
B. how children learn and what happens when we speak
C. why animals can understand some things more quickly than human beings
D. at what age,a child can speak his language very well
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下面叙述不正确的是()。
A. 广州20岁青年上大学者和待业者比例相同
B. 四川20岁青年上大学者与参加工作者比例相同
C. 新疆20岁青年参加工作者是待业者的4倍
D. 北京20岁青年参加工作者比例最低
Which of the following would be the best title for the passage？
A. President John Adams and the White House
B. White House Today
C. A House Full of History
D. White House Before 1812
Many consider the later part of life to be the best time of living,because______．
A. they have a very good understanding of themselves and the outside world
B. they consider their life has been a successful one
C. they have come through the battle of life safely
D. they have nothing to do all day long only to watch their grand children growing up around them
I saw Mr. Zhang a moment ago. He ______ to Germany.
A. can't go
B. couldn't have gone
C. mustn't go
D. mustn't have gone
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