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B）improvements some airlines have made are not effective，which leads to more complaints
C）there may be a need to pass laws to improve airline customers service
D）some people are too aggressive when complaining about air service though airlines have made great efforts on it
70．In paragraph 1，the phrase"pounding on" means" _______"．
A）striking at
B）urging
C）attacking
D）soundings with loud noises
Part IV Cloze（15 minutes）
Directions：There are 20 blanks in the following passage．For each blank there are four choices marked A），B），C）and D）．You should choose the ONE that best fits into the passage．Then mark the corresponding letter on the Answer Sheet with a single line through the centre．
AIDS threatens not only lives but also- in poor countries-economic development．By71mainly at adults 20 to 49 years old， AIDS robbs these societies72 some of their most productive citizens．Ignorance and fear of disease the can disrupt families and communities and may even73 political relations between nations．
Because AIDSis a worldwide epidemic（传染病，流行病），nothing74 than a worldwide effort can control and perhaps some day wipe the disease．Governments must75 by fully informing their citizens76 the epidemic and，most important，by telling people77 actions they can take to prevent infection（感染）．Public health agencies must also insure that blood transfusions（输血） and78 are safe．Those already infected should receive79 attention so they do not spread the virus to others．
80 ，the U．S．government has committed more than two billion dollars to fight81 AIDS in 1989-including more than 600million dollars for research．The screening of blood82 has already ensured the safety of blood supplies in the U．S．，and American military personnel are required to take83blood tests．Public health groups have carried84 AIDS education programs aimed particularly at homosexuals， 85 addicts，and others whose behavior makes them highly sus- ceptible（易受影响的） 86 the virus． U．S．government agencies are also87public health authorities throughout the developing world in their efforts to88 the spread of the AIDS virus and to treat those afflicted with the disease． 89 the rapid spread of the disease and the number of people now infected，the battle against AIDS will bedifficult to win．But it's a battle the world cannot90 to lose．
71．A）striking B）stickingC）stirring D）stinging
72．A）from B）for C）of D）off
73．A）promoteB）destroy C）strengthenD）strain
74．A）less B）moreC）ratherD）better
75．A）cooperateB）correspondC）coordinateD）contradict
76．A）on B）against C）aboutD）over |
