[单项选择]By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.
A. are living
B. will be living
C. have lived
D. will have lived

[单项选择]By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.
A. are living
B. will be riving
C. have lived
D. will have lived

[单项选择]The population in the 21st century according to the writer ______.
A. will be smaller than a fw years ago
B. will not be as small as people expect
C. will prove to be a threat to the world
D. will not consitute as serious a problem as expected

[单项选择]The 21st Century is different from the other three schools in that ______.
A. its teaching quality is better
B. it is nearest to the city centre
C. its courses are more advanced
D. it requires an entrance examination

[单项选择]By the first decade of the 21st century, international commercial air traffic is expected ______beyond today's levels.
A. to have extended
B. to be extending
C. being extended
D. having been extended

[单项选择]Since the beginning of the 21 st century, the government has started ______.
A. a plan to produce more milk
B. a plan to offer milk to school children
C. to produce milk for more people
D. to ask schools to offer milk

[单项选择]In the middle of the twentieth century, people in North America ______.
A. were tired of the Nuclear Family
B. wanted to give up the Nuclear Family
C. believed that the Nuclear Family was hopeful
D. were indifferent to the Nuclear Family

[单项选择]The middle of the 18th century was predominated by a newly rising literary form, that is the modem English ______, which gives a realistic presentation of life of the common English people.
A. prose
B. short story
C. novel
D. tragicomedy

[单项选择]The middle part of the 20th century brought new ways to help people get over diseases.
A. 20世纪中叶，人们找到了治疗疾病的新途径。
B. 20世纪中叶带来了帮助人们克服疾病的新办法。
C. 20世纪中叶给人们带来了各种新的疾病。
D. 20世纪中叶人们在路上得到了各种新的疾病。

[单项选择] Since the middle of this century __________ has been learned about space than in all human history before that time.
A. more
B. much
C. better
D. a lot

[填空题]Considering their vast numbers in the seventeenth century，not much sheep are raised in Spain today（）.

[单项选择]

Some futurologists have assumed that the vast upsurge (剧增) of women in the workforce may portend a rejection of marriage. Many women, according to this hypothesis, would rather work than marry. The converse (反面) of this concern is that the prospects of becoming a multi-paycheck household could encourage marriages. In the past, only the earnings and financial prospects of the man counted in the marriage decision. Now, however, the earning ability of a woman can make her more attractive as a marriage partner. Data show that economic downturns tend to postpone marriage because the parties cannot afford to establish a family or are concerned about rainy days ahead. As the economy rebounds, the number of marriages also rises.
Coincident with the increase in women working outside the home is the increase in divorce rates. Yet, it may be wrong to jump to any simple cause-and-effect conclusions. The impact of a wife’s work on divorce is no less cloudy than its impact on mar
A. defy
B. signal
C. suffer from
D. result from

[单项选择]The vast differences in the ways students learn are often_____when they are taught the same thing, in the same way, at the same time. Therefore many of them feel little enthusi astic and even hostile for the ways instruction is handled.
A. disregarded
B. distinguished
C. discharged
D. discerned

[单项选择]The vast majority of people in any given culture will______ to the established standards of that culture.
A. confine
B. conform
C. confront
D. confirm

[单项选择]According to the passage, the vast majority of crimes ______.
A. are very likely solved by routine investigation
B. can not be solved simply through routine investigation
C. are unlikely to be cleared up at all
D. can not be solved because the defendants are unknown