课后练习

1.The existence of oil wells ___ for a long time.have been known B. is known

C. has been known D. is being known

2.Some of the Indians of North America ____ collect and sell the oil from the wells of Pennsylvania.

A. used to B. is used to C. use to D. is using to

3.This led to the development of the wells and ___ the making of enormous profits

A.at B. to C. in D. for

4.What was the origin of the oil ___ now drives our motor-cars and aircraft?

A.what B. where C. in which D. which

5.They think that the oil under the surface of the earth ___ in the distant past

A.origin B. original C. originated D. initial

6.It was necessary that they should be ___ between layers of rocks for an enormous length of time.

A. imprison B. prisoned C. prison D. imprisoned

7.In some places gas and oil ___ to the surface of the sea from its bed

A.come out B. come in C. come up D. come down

8.The rocks ___ oil is found are of marine origin too.

A. in which B. in that C. which D. what

9.And ___ is shale, there is likely to be oil.

A.where B. there C. there where D. where there

10.Sir Walter Raleigh visited the famous ___ lake of Trinidad in 1595.

A.pine B. pitch C. pile D. pinwheel

11.There are probably huge quantities of crude oil beneath the surface

A.rough B. tough C. virgin D. enough

12.During the process of drilling, gas and oil ___ great pressure may suddenly be met.

A.in B. on C. at D. for

13.This danger is well known and steps are always ___ to prevent it

A.made B. had C. taken D. put

14.Gas that comes off the oil later is condensed ___ paraffin.

A. into B. to C. on D. onto

15.There are four main areas of the world ___ deposits of oil appear.

A.which B. that C. where D. what

16.When all the present oilfields are ___, it is possible that this cold region may become the scene of oil activity

A.exhaust B. exhausted C. exhale D. exhaled

17.If progress ___ using atomic power to drive machines is fast enough, it is possible that oil-driven engines may give place to the new kind of engine.

(1) A. on B. at C. with D. in

(2) A. give room for B. leave space for C. be replaced by D. replace

18.In that case the demand for oil will fall, the oilfields will gradually disappear, and the deposits at the North Pole may rest ___ they are for ever.

A. where B. which C. what D. when

答案：1C 2A 3B 4D 5 C 6 D 7 C 8 A 9 D 10 B 11 C 12 C 13 C 14 A 15 C 16 B 17 D C 18 A

补充练习

19. Great sums of money have been spent, for example in the deserts of Egypt, ___ 'prospecting' for oil.

A. inB. onC. upD. for

20. ___ the difficulties will be great, and the costs may be so high that no company will undertake the work.

A. YetB. ButC. AlthoughD. For