单项选择题

In every cultivated language there are tow great classes of words whole, when together,______ the whole vocabulary.

A．take up
B．make up
C．consist of
D．cover up
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单项选择题
I can______ her sudden friendliness; she wants me to look after her parrot while she is away.
A．work out
B．make out
C．see through
D．figure out
单项选择题
People today spend a______ portion of their time conferring on the proper way to bring up children.
A．considerable
B．significant
C．substantial
D．surplus
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