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Something must be done to stop cutting down trees. ________ all the trees are cut down, the valuable soil will be washed away by the heavy rain.

A．Whether	B．Unless
C．Once	D．Until

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Human facial expressions differ from those of animals in the degree___they can be controlled on purpose.

A．with which	B．to which
C．of which	D．for which

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—What do you think we can do for our aged parents?
—You___do anything except to be with them and be yourself.

A．don’t have to	B．oughtn’t to
C．mustn’t	D．can’t

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Leonardo da Vinci(1452-1519)birds kept in cages in order to have the pleasure of setting them free.

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It is not who is right but what is right___is of importance.

A．which	B．it
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-Now let's move on to another topic.Do you follow me?
-,Professor.

A．	No,I am not	B．	Yes,I will
C．	No,I haven't	D．	Yes,perfectly

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