Big Cloud Jumbo Corp正在开始探索将其整个本地数据中心迁移到AWS。 他们非常担心一旦整个

across the sun, Walt, a small boy, looked up. "I smell a storm (暴风雨) ," he thought.

Shorty, a man of forty, had gone into town. He had said he would be back before two. He had told Walt to watch the boats and the shop. There were no people around. They had all gone out on the lake to fish.

So Walt went to work on one of the boats. From there he could hear the telephone if it rang. And he could watch the door.

It was a little after two when the stranger came. Walt saw him stop by the shop. The stranger looked in for a minute. Then he went down to the boats. He was a big man in a coat.

Walt called to him, "Do you want something, sir？"

The stranger looked at Walt and said, "No, thanks." Then the stranger moved slowly away. As he went on, he looked at the boats one by one.

Walt sat there with his eyes on the back of the stranger's coat. He thought, "I can smell something as I smell that storm. I hope Shorty comes back soon."

The story happened ______.

A．on the lake at night

B．by the lake in the afternoon

C．along the river in spring

D．near the river in summer

A.9600

B.1491

C.1522

D.1490

A dark cloud is a ______ of rain.

A．mark

B．signal

C．sign

D．symbol

o another.

A．rush

B．rainbow

C．race

D．rubber

A.MAC

B.sketchcloud

C.MAC+sketch cloud

D.iCloud+sketch cloud

云计算(Cloud Computing)的概念是由()提出的 。

A.IBM

B.GOOGLE

C.微软

D.腾讯

e Earth's Gravity(重力) 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(束) of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about wildly without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2,500 inch in diameter. (78)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 moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall form. the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain.

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.

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.

He made ______ that he had to resign.

A．so a big mistake

B．a so big mistake

C．such a big mistake

D．such big a mistake

The book is ______to be put into the envelope. You need a bigger one.

A．big enough

B．too big

C．very big

D．so big

The book is ______ to be put into that envelope. You need a bigger one. (

A．big enough

B．too big

C．very big

D．so big