[填空题]Many species of animals which once lived on the earth are no longer in (exist) ______ .

[填空题]Many species of animals which once lived on the earth are no longer in (exist) ______.

[单项选择]Practically all species of animals communicate either through sounds or through a large repertory of soundless codes（　）.
A. Simultaneously
B. Almost
C. Absolutely
D. Basically

[单项选择]

It is animals and plants which lived in or near water whose remains are most likely to be preserved, for one of the necessary conditions of preservation is quick burial, and it is only in the seas and rivers, and sometimes lakes, where mud and silt have been continually deposited, that bodies and the like can be rapidly covered over and preserved.
But even in the most favorable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them. After all, all living creatures live by feeding on something else, whether it be plant or animal, dead or alive, and it is only by chance that such a fate is avoided. The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over. When you think of the innumerable birds that one sees flying about, not to mention the equally numerous small animals like field mice and voles w
A. a large number of remains
B. a number of remains
C. only a small number of remains
D. few remains

[简答题]Electronic computers, which have many advantages, cannot carry out creative work and replace man.

[单项选择]The whole industrial process which makes many of the goods and machines we need and use in our daily lives, is bound to create a number of waste products which upset the environmental balance or the ecological(生态的)balance as it is known. Many of these waste products can be prevented or disposed(处理) of sensibly, but clearly while more and more new goods are produced and made complex, there will be new, dangerous wastes to be disposed of, for example, the waste products from nuclear power stations. Many people therefore see pollution as only part of a larger and more complex problem, that is, the whole process of industrial production and consumption of goods. Others see the problem mainly in connection with agriculture, where new methods are helping farmers grow more and more on their land to feed our ever-increasing population. However, the land itself is gradually becoming worn out as it is being used, in some cases, too heavily, and artificial fertilizers(人造肥料) cannot bring back the
A. urging their governments to control litter and waste
B. cutting down the use of oil and other oil products
C. reducing unnecessary buying, over-consumption and careless disposal of wastes
D. making anti-pollution advertisements