单项选择题

We have to think very carefully before we take any action, because it's a very () situation we are in.

A．ideal
B．favourable
C．good
D．severe

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单项选择题

It's hot out on the beach. Let's sit in the().

A．shadow
B．shade
C．dark
D．darkness

单项选择题

I could hear nothing except the roar of aircraft engines which () all other sounds.

A．overcame
B．overtook
C．suppressed
D．drowned

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