课后练习：

1 Have you ever _____ howyour life would change if the world _____ oil?

Astopped thinking, ran out of

Bstopped to think, run out of

C stopped to think, ran out of

Dstopped thinking, run out of

2 All _____ their originto the oil known as petroleum, ____ deep in the earth.

A own, founded B owe, find C owing, fund D owe, found

3 As you ____ your bus, train or car, ____ usepetroleum products in the form of fuel to move them in the working order.

A head to,all of which B heading for, all ofwhat

Cheading in, all of them D head for, all ofwhich

4 What are you _____today?

A dressing B weary C wearing D worn

5 Scientists predict thatthe world’s known oil will _____ early in the next century.

A come out B go out C run out of D run out

6 When you ___ a need youwill discover some way offulfillingit.

A faced to B are faced C are facing with Dare faced with

7 Insuch circumstances, the tropicalparts of the world would have a ________ in the race to find new energysources.

A firststar B head-start C stare D upstart

8 If you are comfortably cool in a tropical _____,your air conditioning unit may also depend on oil-fed generators.

Aatmosphere B climate C weather D whether

9 Fertilizers and insecticides made _____petroleum can improve crop production.

A of B by Cfrom D for

10 Can we ____ to use so much of our limitedpetroleum supplies for private motoring?

Aeffort B afterward C afford D affect

11 There is one suggestion that the wheeledtraffic and the footsteps of crowds ____ the streets in major cities couldgenerate energy.

Awalk B walks C walked D walking

12 one company has presented an idea ____ metalstrips _____ in pavements and roads operate fly wheels _____ means of a pistonaction using hydraulic fluid.

A in which, inserting, by B in which,inserted, by

C of what, inserted, in D that, inserted, of

答案：1 C 2 D 3 D 4 C 5 D 6 D 7B 8 B 9 C 10 C 11 D 12 B