[单项选择]According to the passage, choices must be made because________.
A. resources are abundant
B. there is too much for us to do
C. there are only 24 waking hours in a day
D. our means are limited, but our wants are unlimited

[单项选择]According to the passage, Crosby has made which of the following assumptions concerning historical means of demography
A. (A) Migration is in most cases dictated by life course events as opposed to the economic factors that contribute to the development of cities.
B. (B) Population growth tends not to affect the availability of proxies for replacing emigrants from population centers.
C. (C) Sedimentary populations are more historically significant than nomadic or migratory ones.
D. (D) It is permissible to rely upon a single source of information in studying population movement patterns.
E. (E) Migration can be disregarded as a demographic pattern in historical contexts prior to the development of large cities.

[单项选择]According to the passage, modern industry must have developed ______ .
A. before the Middle Ages
B. about in the nineteenth century
C. in Greece or Rome
D. machines to take tests

[单项选择]According to the passage, the advertising man must have the ability to ______.

[单项选择]According to the passage, the US President must ______.

[单项选择]According to the passage, a flashbulb can be made to burn longer by using
A. ( thicker wire
B. ( more oxygen
C. ( thinner glass
D. ( continuous electricity

[单项选择]According to the passage, a good speaker must ______.
A. "sell" his or her ideas to an audience
B. maintain direct eye contact with listeners
C. be very persuasive and believable
D. be exceptionally well-disposed

[单项选择]According to the passage,
A. the problem of student cheating has its roots in deeper problems
B. students do not cheat on essay tests
C. a change in the educational system will eliminate the need to cheat
D. punishment is an effective method of stopping cheating

[单项选择]According the passage, the housework often brings satisfaction to women ______.
A. who are very rich
B. who envy their neighbors
C. who work outside the home
D. who are dependent on their husbands

[单项选择]According to passage, Indian names were important because they ______.
A. described the character of a man
B. described the appearance of a man
C. were never used by other people
D. told us his profession

[单项选择]According the passage we know that the two brothers ______.
A. got a large amount of money from their uncle
B. used to make a living by fishing and were quite rich
C. once lived in poverty
D. gave up the search for the sunken treasure after they had a try

[单项选择]According to passage, human beings can survive almost everywhere on Earth because ______.
A. they have developed advanced forms of transportation
B. they have learned how to process seawater for drinking
C. their body temperature can vary considerably
D. their shelters and clothing help them to adapt to the environment

[单项选择]According to the passage, Sommer
A. inherited huge problems.
B. splurged the company asset.
C. tried out successful reforms.
D. regarded Ricke highly and helped him.