单项选择题

What is the main topic of the passage

A．The mechanics of rain.
B．The climate of North America.
C．How gravity affects air current.
D．Types of clouds.
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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．The growth of droplets.
C．The fall of raindrops and other precipitation.
D．The movement of dust particles in the sunlight.
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 garag
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