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I second Mr. Smith's motion that we______a special board to examine the problem.

A. set up
B. have to set up
C. are to set up
D. may set up

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According to Dr. Mead, the attitude of beings from outer space towards us is one of ______.

A. unfriendliness
B. suspicion
C. superiority
D. hostility

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A．Go to classroom early to show respect for the teacher.B．Go to classroom early so as n

A. Go to classroom early to show respect for the teacher.
B. Go to classroom early so as not to annoy the teacher.
C. Go to classroom early to find a seat she likes to take.
D. Go to classroom early to find a front seat.

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在双缝衍射实验中，若保持双缝SA和SB的中心之间的距离d不变，而把两条缝的宽度α略微加宽，则单缝衍射的中央主极大变窄，其中所包含的干涉条纹数目有可能变少。

A. 正确
B. 错误

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Agriculture is the country's chief source of wealth, wheat______ by far the biggest cereal

A. is
B. been
C. be
D. being

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I second Mr. Smith's motion that we______a special board to examine the problem.

A. set up B. have to set up C. are to set up D. may set up

According to Dr. Mead, the attitude of beings from outer space towards us is one of ______.

A．Go to classroom early to show respect for the teacher.B．Go to classroom early so as n

在双缝衍射实验中，若保持双缝SA和SB的中心之间的距离d不变，而把两条缝的宽度α略微加宽，则单缝衍射的中央主极大变窄，其中所包含的干涉条纹数目有可能变少。

Agriculture is the country's chief source of wealth, wheat______ by far the biggest cereal

A. set up
B. have to set up
C. are to set up
D. may set up