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【单选题】
Electronic devices are allowed to be turned on during flight probably because______.
A.
they have no interference with plane's communications
B.
they are necessary devices to some passengers
C.
the reason to switch them off is different from that of cell-phone
D.
the interference they bring doesn't last long
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参考答案:
举一反三
【单选题】--- Whose names are these, ________ or yours? ---_______. I don’t know all of the students in Class 5, so I have _______on this piece of paper.
A.
theirs; Theirs; them
B.
their; Theirs; they
C.
their; Theirs; them
D.
theirs; They; them
【单选题】Don't pretend __________;after all, we are only lookers-on.
A.
to know what is what '
B.
to know what was what
C.
knowing what is what
D.
knowing what was what
【单选题】耐油橡胶属于()。
A.
氯丁橡胶
B.
天然橡胶
C.
丁腈橡胶
D.
普通橡胶
【单选题】聚硫橡胶属于
A.
碳链聚合物
B.
元素有机聚合物
C.
杂链聚合物
D.
不属于聚合物
【单选题】聚硫橡胶属于
A.
碳链聚合物
B.
杂链聚合物
C.
元素有机聚合物
D.
不属于聚合物
【判断题】橡胶属于多萜类化合物。( )
A.
正确
B.
错误
【单选题】It is the fact ______he doesn’t know his own birthday ______surprises us all.
A.
which; which
B.
that; that
C.
which; that
D.
that; which
【单选题】聚硫橡胶属于
A.
不属于聚合物
B.
碳链聚合物
C.
杂链聚合物
D.
元素有机聚合物
【单选题】下列合成橡胶属于通用橡胶的是()
A.
氟橡胶
B.
硅橡胶
C.
丁苯橡胶
D.
氟硅橡胶
【单选题】选出对别时茫茫江浸月理解正确的一项( )
A.
告别友人时,心中一片茫然,江水中月影迷离,似弥漫着诗人的陶醉之情。
B.
景中含情,茫茫江水,溶溶月色中弥散着的是诗人挥洒不去的离愁别绪。
C.
情景交融,点洒出哀伤之别的幽愁怨恨像茫茫江水。
D.
诗人的心情已被融化在这一片迷离的月色之中。
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