4.如果一个选项合乎题意，还要看其它选项中是否有both-----and, all of the above 的字样。
5.注意题干中是否有not , except 字样。
1. The average air temperature at the surface of the earth has risen this century, as has the temperature of ocean surface waters. Because water expands as it heats, a warmer ocean means higher sea levels. We cannot say definitely that the temperature rises are due to the greenhouse effect; the heating may be part of a "natural" variability over a long time-scale that we have not yet recognized in our short 100 years of recording. However, assuming the build up of greenhouse gases is responsible, and that the warming will continue, scientists-and inhabitants of low-lying coastal areas--would like to know the extent of future sea level rises.
2. Calculating this is not easy. Models used for the purpose have treated the ocean as passive, stationary and one-dimensional. Scientists have assumed that heat simply diffused into the sea from the atmosphere. Using basic physical laws, they then predict how much a known volume of water would expand for a given increase in temperature. But the oceans are not one-dimensional, and recent work by oceanographers, using a new model which takes into account a number of subtle facets of the sea-including vast and complex ocean currents-suggests that the rise in sea level may be less than some earlier estimates had predicted.
(1) Scientists do not know for sure why the air and surface of ocean temperatures are rising because ...
A there is too much variability.
B there is not enough variability.
C they have not been recording these temperatures for enough time.
D the changes have only been noticed for 100 years.
(2) New research leads scientists to believe that ...
A the oceans are less complex.
B the oceans are more complex.
C the oceans will rise more than expected.
D the oceans will rise less than expected.
3. Even though earthquake prone countries spend enormous human and financial resources on seismographic measurement, as a means of predicting earthquakes, there is a danger in paying too much heed to seemingly high risk zones and erecting less stable buildings solely because of their being in a low risk zone. Prior to the earthquake, Kobe was not regarded as at serious risk, but after the disaster, investigation of the damage revealed that nearly all deaths occurred in small buildings that shattered rather than twisted when stressed. Coup/ed with the problem of soft soils, the buildings had little firm support and many crumb/ed. If countries wish to withstand the devastating forces of substantial earthquakes and reduce death, injury and property damage, it is important to design and construct buildings that are earthquake resistant, as well as monitor seismic forces.
(1) It is now believed that ...
A low-risk zones are relatively safe.
B high-risk zones are more dangerous than low-risk zones.
C low-risk zones may in fact be very dangerous due to poorly constructed buildings.
D high-risk zones have stable buildings.
(2) Soft soils ...
A together with poorly constructed buildings and being in high-risk zones greatly contribute to earthquakes devastation.
B cause earthquakes.
C cause buildings to twist rather than shatter.
D crumble buildings.
(3) Seismologists ...
A can predict the potential destruction of a city by an earthquake.
B can not predict where an earthquake may occur .
C had been investigating Kobe’s potential for an earthquake and had warmed the inhabitants.
D could work with other professionals to understand and try to minimize the level of death and injury caused by major earthquakes.
出现绝对词的选系项90%不是答案。All, most, only, always, usually, invariably, greatly, entirely, largely等。