单选题：Black holes exist but are difficult to observe.

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题目内容：
Black holes exist but are difficult to observe. A．Right
B．Wrong
C．Not mentioned

参考答案：
答案解析：

The workers finally called offthe strike.

The workers finally called offthe strike.A．put off B．ended C．cancelled D．took of

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The factory can produce a lot of rubbish every day.

The factory can produce a lot of rubbish every day.A．make B．apply C．finish D．red

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Come out, or I'll burst the door down.

Come out, or I'll burst the door down.A．shut B．beat C．set D．break

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I realized to my horror that I had forgotten the present.

I realized to my horror that I had forgotten the present.A．limit B．fear C．power

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Under the terms of the contract, you must give 3 months' no

Under the terms of the contract, you must give 3 months' notice before you leav

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