30．_______ I know about this competition_爱下问搜题

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问题选择题

30．_______ I know about this competition is that it is held every two years.

A．That

B．What

C．As

D．How

答案

B

读图填空题

下图为衣藻，请据图填出所示结构的名称。

[1]______、[2]________、[3] ________ [4]________

单项选择题

刮涂腻子时刮刀应与被涂表面成（）角。

A、30～45

B、45～60

C、60～80

D、80～100