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问题 单项选择题

在筛分过程中，存在某粒度的所有颗粒有一半进入筛上物，另一半进入筛下物，则该粒度称为（）。

A、筛下粒度

B、临界粒度

C、筛分粒度

D、筛上粒度

答案

参考答案：C

填空题

医疗废物不包括（）。
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完形填空

根据情景，把下面对话内容补充完整，使其意思连贯。

(P="Peter," an exchange student from the UK; W="Wang" Tao, Peter’s classmate)

W: Hi, Peter. Shall we play football after school?

P: 1.            ▲            But I would like to try something new.

W: Oh, what’s that?

P: Table tennis. 2.            ▲           

W: Yes, we play it a lot. Can you play it?

P: No, I can’t. I tried, but 3.            ▲            

W: Well, never mind. You can play football very well.

P: 4.            ▲            for saying so, but you must teach me how to play table tennis.

W: No problem. 5.            ▲           

P: Great. Every Friday after school.
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