单项选择题
- A.It was by continuous exploitation of the environment.
B.It was largely by chance.
C.It was because of houseflies.
D.It was by chance initially and by cleverness now.
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A.They suffer from mental pains.
B.They start doing something in an active way.
C.They become uninterested in class activities.
D.They may grow up to be passive watchers. -
单项选择题
A.They have three children already.
B.Cathy wishes to have a baby, but Tom doesn’t.
C.They will start a family as soon as they get married.
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单项选择题
A.To look at the audience directly.
B.To look at something else in the room.
C.To be better prepared before presentation.
D.To ask psychologists for help.
