英语四级

单项选择题
1、Questions are based on the following passage．
Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity．It requires no equipment, everyone knows how to do it and it carries the___36_____risk of injury．The human body is designed to wall．You can walk in parks or along a river or in your neighborhood．To get___37_____benefit from walking, aim for 45 minutes a day, an average of five days a week．
Strength training is another important___38_____of ．physical activity．Its purpose is to build and____39____ bone and muscle mass, both of which shrink with age．In general, you will want to do strength training two or three days a week, ___40_____recovery days between sessions．
Finally, flexibility and balance training are___41_____important as the body ages．Aches and pains, are high on the list of complaints in old age．The result of constant muscle tension and stiffness of joints, many of them are___42_____, and simple flexibility training can____43____these by making  muscles stronger and keeping joints lubricated (润滑)．Some of this you do whenever you stretch．If you watch dogs and cats, you'll get an idea of how natural it is．The general  ___44_____is simple: whenever the body has been in one position for a while, it is good to ___45_____stretch it in an opposite position．
A．allowing
B．avoidable
C．briefly
D．component
E．determined
F．helping
G．increasingly
H．lowest
I．maintain
J．maximum
K．prevent
L．principle
M．provoke
N．seriously
O．topic
第(36)题应填__________


2、听录音,
回答题

A． Go to a place he has visited．
B． Makeherownarrangemenm． 
C． Consult a travel agent． 
D． Join in a package tour．


3、听录音,
回答题

A．He likes biology enough to continue with it.
B．His grades in science courses are very good.
C．He hasn't taken enough courses in biology.
D．He doesn't want to take any more science courses.


4、根据材料，回答问题。
Questions 61 to 65 are based on the following passage.
In the second half of the twentieth century, many countries of the South ( 发展中国家) began to send students to the industrialized countries for further education. They urgently needed supplies of highly trained personnel to implement a concept of development based on modernization.
But many of these students decided to stay on in the developed countries when they had finished their training. At the same time, many professionals who did return home but no longer felt at ease there also decided to go back to the countries where they had studied.
In the 1960s, some Latin American countries tried to solve this problem by setting up special "return" programs to encourage their professionals to come back home. These programs received support from international bodies such as the International Organization for Migration, which in 1974 enabled over 1,600 qualified scientistsand technicians to return to Latin America.
In the 1980s and 1990s, "temporary return" programs were set up in order to make the best use of trained personnel occupying strategic positions in the developed countries. This gave rise to the United Nations Development Program's Transfer of Knowledge through Expatriate ( 移居国外的 ) Nationals, which encourages technicians and scientists to work in their own countries for short periods. But the brain drain (人才流失) fromthese countries may well increase in response to the new laws of the international market in knowledge.
Recent studies forecast that the most developed countries are going to need more and more highly qualified professionals around twice as many as their educational systems will be able to produce, or so it is thought. As a result there is an urgent need for developing countries which send students abroad to give preference to fields where they need competent people to give muscle to their own institutions, instead of encouraging the training of people who may not come back because there are no professional outlets for them. And the countries of the South must not be content with institutional structures that simply take back professionals sent abroad, they must introduce flexible administrative procedures to encourage them to return. If they do not do this, the brain drain is bound to continue.