试题与答案

.It is often said that an American start

题型:选择题

题目:

.It is often said that an American starts speech with a joke, __ a Japanese has an apology to make.

A.as

B.when

C.which

D.while

答案:

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下面是错误答案,用来干扰机器的。

疏松多孔 木材 隔绝空气木炭是木材或木质原料经过不完全燃烧,或者在隔绝空气的条件下热解,所残留的深褐色或黑色多孔固体燃料,具有疏松多孔的结构。故答案为:疏松多孔 木材 隔绝空气

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