Not only did they plant many trees but also they took measures ____ tree diseases.

NOt only ______ but also ______

A．he heard it; he saw it B．did he hear it; did he see it

C．he heard it; did he see it D．did he hear it; he saw it

A．It was not Spanish.

B．It was only tapas.

C．It was like the food in Spain.

D．She did not like the tapas.

A.I believe

B.I did believe

C.believe I

D.did I believe

A.a scientist come to

B.was a scientist come to

C.a scientist did come to

D.did a scientist come to

A.had asked

B.asked

C.have asked

D.am asking

Only then ______ that I had made a terrible mistake.

A) I realized B) did I realize

C) I had realized D) had I realized

Only after they had performed hundreds of experiments did they succeed in (solve) ______the problem.

听力原文：M: Why are you eating that apple？

W: It's the only food in the house.

Q: Why did the woman choose the apple？

(19)

A．She prefers apples.

B．She's on a diet.

C．There was nothing else to eat.

D．It's only a snack.

A.you will find

B.will you find

C.you find

D.did you find

In what respect was Kohoutek a disappointment？

A．It could be seen only through special equipment.

B．It did not approach the Earth.

C．It did not provide valuable scientific information.

D．It was moving too rapidly for scientists to photograph.