语法

1._____ a necessary dimension for measuring astronomical space and the distance of heavenly bodies form the Earth.

(A)Once in time

(B)Time is

(C)The time

(D)It is time

2.Jackie Joyner-Kersee,_____ the world record in the heptathlon in the 1988Olympics,also won the long jump in the year.

(A)whose setting

(B)which she set

(C)whoever set

(D)who set

3.The fossilized remains of a type of camel _____ a dog have been found in the Bad Lands of South.

(A)no more large

(B)no larger than

(C)not larger

(D)which no larger

4.Gorillas are quiet animals,_____ they are capable of making about 20different sounds.

(A)whether

(B)which

(C)even though

(D)as well as

5.Although the Earth's chemical composition had been studied for years,only toward the end of the nineteenth century _____ as a discipline in its own right.

(A)when geochemistry was recognized

(B)was recognized as geochemistry

(C)then recognized as geochemistry

(D)as geochemistry was recognized