单项选择题

In this passage, what does the term "coalescence" refer to

A．The gathering of small clouds to form large clouds.
B．1'he growth of droplets.
C．The fall of raindrops and other precipitation.
D．The movement of dust particles in the sunlight.

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热门试题

单项选择题

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.

单项选择题

What does the man offer to do for Helen

A．Drive, her to the :test site.
B．Help her get ready for the road test.
C．Sell her a car.
D．Drive her car into her garage.