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问题 单项选择题

锅炉受压元件进行挖补时，补板应是规则形状且四个角应为（）。

A.半径不小于100mm的圆角

B.直角

C.以上两者均可

答案

参考答案：A

阅读理解
读句子，判断对(√)错(×)。

( ) 1. Ben can clean the room. He often cleans his room on the weekend.
( ) 2. Ben sometimes visits his grandma on the weekend.
( ) 3. Ben can't wash clothes. He doesn't wash his clothes at home.
( ) 4. Ben usually plays sports after school.
( ) 5. Ben can cook dinner and he does the dishes, too.
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选择题

Would you please explain＿＿＿you do to make .your students so interested in your lessons?

A．what is it that

B．that what is it

C．that what it is

D．what it is that
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