单项选择题

What is not mentioned in the passage

A．Rain does not fall from all the clouds.
B．The effect of the gravity on droplets is minute.
C．The average raindrop contains much more water than a tiny cloud droplets.
D．The shape of the clouds have a great influence on the raindrop.

<上一题目录下一题>

热门试题

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.

单项选择题

What can be inferred about drops of water larger than 1 125 inch in diameter

A．They never occur.
B．They are not affected by the force of gravity.
C．They would fall to earth.
D．In moving air they fall at a speed of thirty-two miles per hour.