若硬盘中已装有DOS系统，现将DOS系统盘插入软盘驱动器A中，计算机启动后，在屏幕上显示的

Many Americans are interested in China because ______.

A．they want to come here to take part in the 2008 Olympic Games

B．they have learned something of China and they want to learn more

C．great changes have been taking place in China

D．China has a "great history" and an "unbelievably exciting future"

Landsat 7 knows that Alaskan glaciers have shrunk because ______.

A．sightseers have noted the changes

B．computer-animated views have shown the shrinkage

C．one of the glaciers was hit by a ship

D．the temperatures are much colder

Why do American restaurants serve large portions？

A. Because Americans have big bellies.

B. Because Americans associate quantity with value

C. Because Americans are good eaters.

D. Because Americans are too weak.

Landsat 7 knows that Alaskan glaciers have shrunk because ______.

A．sightseers have noted the changes

B．computer-animated views have shown the shrinkage

C．one of the glaciers was hit by a ship

D．the temperatures are much colder

37 Why do American restaurants serve large portions？

A Because Americans associate quantity with value.

B Because Americans have big bellies.

C Because Americans are good eaters.

D Because Americans are too weak.

Why do more Americans have to drive to work？

Because they have moved out of the ______to the suburbs.

37 Why do American restaurants serve large portions？

A Because Americans associate quantity with value．

B Because Americans have big bellies．

C Because Americans are good eaters．

D Because Americans are too weak．

changes B．computer-animated views have shown the shrinkage C．one of the glaciers was hit by a ship D．the temperatures are much colder

Alex______that window because he never came anywhere near here yesterday.

A．must have broken

B．couldn't have broken

C．mustn't have broken

D．might have broken