更多"Why don't all ice crystals in cloud"的相关试题:
[单项选择]Why don't all ice crystals in clouds immediately fall to Earth
A. They are balanced by the pressure of rain droplets.
B. The effect of gravity at high altitude is random.
C. They are kept in the sky by air current.
D. They are moving about with fixed direction.
[单项选择]Ice crystals do NOT immediately fall to Earth because ______.
A. they are kept aloft by air currents
B. they combine with other chemicals in the atmosphere
C. most of them evaporate
D. their electrical charges draw them away from the earth
[单项选择]We are all going to the games. Why don't you come ______
A. up
B. across
C. along
D. to
[单项选择]Why don't you start out early () you don't have to hurry.
A. not until
B. since then
C. so that
D. as if
[单项选择]—I don't feel like going out. Why don't we watch TV at home — ______ You promised to take me out for dinner.
A. Come on!
B. Really
C. Not at all.
D. Why not
[单项选择]Why don't the speakers have any food to eat
A. The rain ruined the food.
B. The restaurant was closed.
C. Neither of them brought any food.
D. Someone took their foo
[单项选择]Why don't the language camp directors want to admit reluctant participants
[单项选择]Why don't some people like canned and frozen vegetables
[单项选择]Why don’t nurses study for as many years as doctors