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【单选题】
阈电位时,通透性突然增大的离子是A.
Na+
B.
Ca2+
C.
K+
D.
Mg2+
E.
Cl-
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【简答题】集体发展的方向和动力是（ ）。
【单选题】Which of the following is true according to the passage?
A.
The volume of the atmosphere is four times that of the world's.
B.
The water in the oceans is the main source of rain and snow on land areas.
C.
The atmosphere is mainly composed of the vapor carded over land by air currents.
D.
The earth cannot support the water in the atmosphere if it falls down onto the earth suddenly.
【单选题】Which of the following is TRUE according to the passage?
A.
The volume of the atmosphere is four times that of the world's oceans.
B.
The water in the oceans is the main source of rain and snow on land areas.
C.
The atmosphere is mainly composed of the vapor carried over land by air currents.
D.
The earth can not support the water in the atmosphere if it falls down onto the earth suddenly.
【简答题】________是集体发展的方向和动力。
【单选题】According to the man, which of the following is NOT the reason why the party is successful?
A.
The decoration is good.
B.
There are few leftovers.
C.
The friends are very helpful.
D.
The guests enjoy the music.
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