30．____ from the moon, the earth looks like a colorful ball.

A．Seeing

B．Seen

C．Having seen

D．Having been seen

29．The bad weather meant ____ the rocket launch (发射)for 48 hours.

A． delaying

B．to delay

C．having delayed

D．to have delayed

28．Some people want to go hunting, ____ others want to go finishing.

A．or

B．because

C．while

D．since

27．I met Suzane White shortly after the Second World War, and that ____ about March 1946, I suppose.

A．is

B．may be

C．must have been

D．may have been

26．Will you pass me ____, please?

A．salt

B．the salt

C．a salt

D．salts

25．---- When were you there?

---- I was there ____ the summer.

A．in

B．for

C．since

D．during

24．The building ____ windows are bright is our school library.

A．where

B．of which

C．in which

D．whose

23．---- I'd like to buy an expensive sports car.

---- Well, Mike, we have got several models ____.

A．to be chosen from

B．to choose

C．to choose from

D．for choosing

22．A　 man' s worth lies not so much in ____ he has as in ____ he is .

A．that, what

B．what, what

C．that, that

D．what, that

第一节：单项填空(共15小题，每小题1分，满分15分)

21．They changed their blue shirts ____ white ones.

A．from

B．with

C．out of

D．for