some countries, would be nullified (抵消 ) if others countries do not control their emissions. Whereas the UN team on climate change has found that the emissions of carbon dioxide would have to be cut globally by 60% to stabilize the content of CO2 in the atmosphere, this path is not feasible for several reasons. Such deep cuts would cause a breakdown of the world economy. Important and populous (人口众多的) low or medium income countries are not yet willing to undertake legal commitments about their energy uses. In addition, the state of world technology would not yet permit us to make such a big leap.

We must, however, find a solution to the threat of global warming early in the 21st century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of

imaginations, in imagining what would happen if we fail to act. Although many living in cold regions would welcome the global warming effect of a warmer summer, few would cheer the arrival of the subsequent diseases, especially where there had been none.

41．The main purpose of this passage is to

A convince people that global warming is a real threat

B criticize some countries for refusing to cut down emissions harmful to the ozone layer

C analyze the problem of global warming

D argue against making deep cuts in emissions

42．The reason why it is difficult to get rid of the threat of global warming is that

A the leaders of many countries are not fully aware of the gravity of the problem

B world technology is not able to solve the problem

C not all the countries are willing to make deep cuts in emissions

D many people welcome the global—warming effect of a warmer summer

43．In the passage the author implies that

A it is always difficult to work out international agreements to cut down emissions harmful to the ozone layer

B it is no longer easy to reach international agreements relating to the environment

C the world had recently become aware of the threat of global warming

D the problem of global warming has largely been solved

44．According to the author, it is impossible at present to cut 60% of carbon dioxide emissions globally because .

A it is only a goal to be reached in the future

B some people are lacking in imagination