A.contribute to

B.assent to

C.succumb to

D.resort to

正确答案：contribute to

10、II.词组扩展：阅读以下句子，从每题的四个选项中选择一个最佳答案。

5.Ants store food， repel attackers and use chemical signals to contact one another（）attack.

A.with regard to

B.in control of

C.with relevance to

D.in case of

正确答案：in case of

第四章单元测试

1、II.Choose the best topic sentence from the groups blow.

A.Next， add antifreeze to your windshield washer fluid； otherwise， the fluid will freeze and possibly break the container.

B.First， put on snow tires if you plan to drive on snowy， icy roads very often.

C.C.Driving in winter， especially on snowy， icy roads， can be less troublesome if you take a few simple precautions.

D.Finally， it is also a good idea to carry tire chains， a can of spray to unfreeze door locks， and a windshield scraper in your car when driving in winter weather.

E.Second， check the amount of antifreeze in your radiator and add more if necessary.

正确答案：C.Driving in winter， especially on snowy， icy roads， can be less troublesome if you take a few simple precautions.

2、II.Choose the best topic sentence from the groups blow.

A.A breakthrough in one of these areas will hopefully provide a means of relieving both the overstretched oil market and the environment.

B.Researchers in the automobile industry are experimenting with different types of engines and fuels as alternatives to the conventional gasoline engines.

C.One new type of engine， which burns diesel oil instead of gasoline， has been available for several years.

D..Finally， several automobile manufacturers are experimenting with methanol， which is a mixture of gasoline and methyl alcohol， as an automobile fuel.

E.A further type is the gas turbine engine， which can use fuels made from gasoline， diesel oil， kerosene and other petroleum distillates.

F.The increasing depletion of oil reserves， along with environmental concerns， have prompted some radical developments in car design over the past few years.

正确答案：The increasing depletion of oil reserves， along with environmental concerns， have prompted some radical developments in car design over the past few years.

3、II.Choose the best topic sentence from the groups blow.

A.Later on， people began to write on pieces of leather， which were rolled into scrolls.

B.In the earliest times， people carved or painted messages on rocks.