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.
