题目内容

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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The focus of this book is to develop ______.

A. writing skill
B. reading skill
C. speaking and listening skills
D. listening, speaking, reading and writing skills

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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

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

The focus of this book is to develop ______.

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