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【单选题】
最早观察到细胞的研究者是( )A.
胡克
B.
詹森
C.
列文虎克
D.
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【单选题】What is the greatest danger for people living in a high-rise according to some experts?
A.
Lack of communication with others.
B.
No easy access to a playground for children.
C.
Developing criminal tendencies.
D.
Not knowing the neighbors.
【单选题】You are at sea in an inflatable liferaft．In high latitudes，the greatest danger is ______．
A.
asphyxiation due to keeping the canopy closed
B.
hypothermia caused by cold temperature
C.
collapse of the raft due to cold temperatures
D.
starvation
【单选题】A new computer system has been designed to stop ships sinking. The greatest danger 【21】______ a holed vessel is that flooding of its compartments will make the ship unstable enough to capsize. It is e...
A.
to
B.
on
C.
in
D.
for
【单选题】What is the greatest danger to life on Earth?
A.
Collision with small high-speed missiles.
B.
Collision with an astronomical body.
C.
Collision with stones from the sky.
D.
Collision with spacecrafts.
【简答题】-What is the greatest er for digestive diseases according to the author? - alcohol the greatest digestive diseases.
【简答题】电动机连续控制电路由( )和( )组成
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