Niagara Falls is a great tourist ________ drawing millions of visitors every year.

A．attention

B．attraction

C．appointment

D．arrangement

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参考答案

四选项的意思分别是：A．“注意力”；B．“吸引点”；C．“约会”；D．“安排”。

1 Only under special circumstances ________ to take make-up tests.

A．are freshmen permitted

B．freshmen are permitted

C．permitted are freshmen

D．are permitted freshmen

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2 I had just started back for the house to change my clothes ________I heard voices.

A．as

B．when

C．after

D．while

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3 It seems oil________ from this pipe for some time. We '11 have to take the machine apart to put it right.

A．had leaked

B．is leaking

C．leaked

D．has been leaking

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