In order to live longer______.
A. we have to try to be on a diet
B. we shouldkeep inhigh spirits
C. we should trV to do more exercise
D. we should postpone the process of aging
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In 2006, she was elected ______ chairman of the Student Union.
A. an
B. a
C. \
D. the
We can refer from the passage that the White House was first built ______.
A. on a low and damp site
B. among trees and flowers
C. on a small island
D. on a small hill
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
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