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【单选题】
用显微镜观察撕下的蚕豆叶下表皮装片和蚕豆叶的横切面装片，可以看到右面有关气孔的两个图象．下列叙述正确的是（ ）A.
图a、图b都是气孔的侧面观
B.
图a、图b都是气孔的上面观
C.
图a为侧面观，图b为上面观
D.
图a为上面观，图b为侧面观
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【单选题】— What's that terrible noise? — The neighbours for a party. [ ]
A.
have prepared
B.
are preparing
C.
prepare
D.
will prepare
【单选题】The physicist has made a discovery, _____ of great importance to the progress of science and technology. (TE44-1997-45)
A.
I think which is
B.
that I think is
C.
which I think is
D.
which I think it is
【简答题】电气控制线路中,既装设熔断器,又装设热继电器,各起什么作用?能否相互代用?
【单选题】I．单项选择， (15分) ( )1． Nowadays science fiction isn’t as ___________ as cartoons among teenagers．
A.
popular
B.
more popular
C.
less popular
D.
the most popular
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