28. ____, he sometimes makes mistakes. A

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问题选择题

28. ____, he sometimes makes mistakes.

A．Though he is careful teacher

B．As he is careful

C．A careful teacher as he is

D．Being a careful teacher

答案

答案：C

选择题

The local TV program Kankankan(看看看) can often help solve problems and draw attention to situations_______ help is needed.

A．that

B．whose

C．where

D．which

问答题

压力容器按设计压力可分为哪几类相应的代号及压力范围各是什么？