语法(Page 167)

B

1.The ponderosa pine is _____ of most of the timber used by forest product firms in the Black Hills of South Dakota.

(A)the source

(B)as source

(C)the source which

(D)because the source

2.Computers that once took up entire rooms are now _____ to put on desktops¹ and into wristwatches.

(A)small enough

(B)smaller than

(C)so small

(D)as small as

3.According to some educator,the goal of teaching is to help students learn what _____ to know to live a well-adjusted and successful life.

(A)do they need

(B)they need

(C)they are needed

(D)as they may need.

4.The sapphire's transparency to ultraviolet and infrared² radiation makes _____ in optical instruments.

(A)it is of use

(B)it uses

(C)it a useful

(D)it useful

5._____ initial recognition while still quite young.

(A)Most famous scientists achieved.

(B)That most famous scientists achieved

(C)Most famous scientists who achieved

(D)For most famous scientists to achieve.

6.Mango trees,_____ densely³ covered with glossy⁴ leaves and bear small fragrant⁵ flowers,grow rapidly and can attain⁶ heights of up to 90feet.

(A)whose

(B)which are

(C)are when

(D)which

7._____,the Canadian composer Barbara Pentland wrote four symphonies,three concertos,and an opera,among other works.

(A)An artist who,prolific⁷

(B)Is a prolific artist

(C)Prolific an artist

(D)A prolific artist

8.The Chisos Mountains in Big Bend National Park in Texas were created by volcanic⁸ eruptions⁹ that occurred _____.

(A)the area in which dinosaurs¹⁰ roamed

(B)when dinosaurs roamed the area

(C)did dinosaurs roam the area

(D)dinosaurs roaming the area.

9.In bas-relief sculpture,a design projects very slightly from its background,_____ some coins.

(A)as on

(B)because

(C)the way that

(D)similarly.

10.Alaska found the first years of its statehood costly¹¹ because it had to take over the expense of services _____ previously¹² by the federal government.

(A)To provide

(B)Be provided

(C)providing

(D)provided.

11.With age,the mineral content of human bones decreases,_____ them more fragile.

(A)make

(B)and to make

(C)thereby making

(D)which it makes.

12.Not until Kentucky's Mammoth¹³ Cave had been completely explored in 1972_____.

(A)when was its full extent realized(B)that its full extent realized

(C)was its full extent realized

(D)the realization¹⁴ of its full extent.

13.The first explorer _____ California by land was Jedediah Strong Smith,a trapper who crossed the southwestern deserts of the United States in 1826.

(A)that he reached(B)reached

(C)to reach

(D)reaching it

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