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问题 选择题

Before a problem can be solved, it must be obvious ________ the problem itself is.[ ]

A. what  

B. that

C. which 

D. why

答案

答案：A

阅读理解

阅读理解。

     The afternoon sun was warm on the men who were working on the doors and window frames(框). One of

the workmen was called Adam. He was taller than the other man and could be heard singing above the sound of

the hammer. Now and then some measurement required more concentrated (集中的) attention and the cheerful voice became a low whistle but soon it broke out again and was as loud as before. Such a voice could. come

only from a broad chest and the broad chest belonged to a large-bone muscular (肌肉发达的) man, nearly six

feet tall, with a straight back and strong arms.

1. The atmosphere in this passage is _____ .

A. peace and calm

B. warm and cheerful

C. quiet and free

D. noisy

2 . Adam might best be described as _____ .

A. strong and happy

B. serious and hard-working

C. rough but funny

D. careless and shy

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单项选择题

物体表面的法线是（）

A、穿过物体的一条直线

B、垂直于表面的一条向量

C、垂直于表面的一条矢量

D、垂直于物体的一条向量
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