18.According to the author, we cannot sleep well when we ().

A. 　 the differences between robots and men

B. 　 the reason why men need to sleep

C. 　 about the need for robots to save power

D. 　 about the danger of men working at night

A. 　 Status

B. 　 Statue

C. 　 Stature

D. 　 State

A. 　 extended

B. 　 amounted

C. 　 added

D. 　 turned

A. 　 to show that city people all over the world have a lot in common

B. 　 to let his readers be aware that they are some of the world＇s biggest cities

C. 　 to illustrate their difference from American cities

D. 　 because they are some of the cities that attract visitors most

A. 　 human faces have complex features

B. 　 people differ in their behavioral and physical characteristics

C. 　 human fingerprints provide unique information

D. 　 people’s behavior can be easily described in words

A. 　 Parents don’t give them money until they really need it.

B. 　 Children are taught the financial facts of life at school.

C. 　 Parents regularly give them a certain amount of money.

D. 　 Parents help children become skillful money earners.

A. 　 reworded

B. 　 rewritten

C. 　 processed

D. 　 revised

A. 　 decrease

B. 　 create

C. 　 define

D. 　 delight

A. 　 are directly related to pleasure

B. 　 will meet their physical needs

C. 　 will bring them a feeling of success

D. 　 will satisfy their curiosity

A. 　 specific

B. 　 dynamic

C. 　 heroic

D. 　 diplomatic