[单项选择]What makes rain fall

[单项选择]

What makes it rain Rain falls from clouds for the same reason anything falls to Earth. The Earth’s gravity pulls it. But every cloud is made of water droplets or ice crystals. Why doesn’t rain or snow fall constantly from all clouds The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.
Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0. 0004 inch in diameter. It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of mo
A. They never occur.
B. They are not affected by the force of gravity.
C. In still air they would fall to earth.
D. In moving air they fall at a speed of thirty-two miles per hour.

[单项选择]Rain abates in the fall throughout most of the Appalachian Mountain region.
A. pours
B. accumulates
C. lessens
D. evaporates

[单项选择]Towards evening ______ cold rain began to fall.
A. the,a
B. ×,×
C. a,the
D. an,a

[单项选择]What makes American people more pessimistic


A. The fast pace and complicated way of life.
B. Too much leisure time.
C. Loose relationship between people.
D. All of the abov

[单项选择]What makes scientists doubt about the belief that Megalodon is extinct


A. The discovery of many "Living Fossils".
B. The discovery of the fossils of lobsters.
C. The discovery of a live Coelacanth.
D. The discovery of the fossils of sea urchins.

[单项选择]According to the passage, what makes acquisitions easier