费费117，112

feifei 112

older united states automobilesv have been indentified as contributing disproportionately to global air pollution. the reqirement in many jurisdictions that automobiles pass emission--control inspections has had the effect of taking many such automobiles out of service in the united states, as they fail inspection and their owners opt to buy newer automobiles. thus the burden of pollution such older united states automobiles contribute to the air atmosphere will be gradually reduced over the next decades.

which one of the following, if true, most seriously weaken the argument?

A it is impossible to separate the air of one country or jurisdiction from that of others. since air current circle the global

B when automobiles that are now new become older, they will, because of a design change, cause less air pollution than older automobiles do now.

C the number of jurisdiction in the united states requiring automobiles topass emission--control inspections is no longer increasing

D

E even if all the older automobiles in teh united states were retired from service, air pollution from united ststes automobiles could still increase if the totall number of automobiles in use should increase significantly

the anwer is C, I chosed E. would you tell me the reason?

feifei117

A certain virtal infection is widespread among children,and about 30 percent of children infected with the virtus develop middle ear infection. antibiotics, although effective in treating bacterial infections, have no effect on virus. yet when middle ear infection in children infected with virus are treated with antibiotics, the ear often clear up.

which one of the following most helps to explain the success of the treatments with antibiotics?

A although some types of antibiotics fail to clear up certain infections, other types of antibiotics might provide effective treatment for those infections.

B children infected with the virus are particularly susceptible to bacterial that infect the middle age

C many children who develop middle ear infections are not infected with virus.

D most virus infections are more difficult to treat than are most bacterial infections.

E among children not infected with the virus, fewer than 30 percent develop middle ear infections.

the anwer is B, i chosed D. would you tell me the reason?

112.题中的结论是thus the burden of pollution such older united states automobiles contribute to the air atmosphere will be gradually reduced over the next decades.

LZ如果注意到红字部分,应该就明白E为什么错了吧~C说jurisdiction数不再增加,就意味着无法淘汰不断增加的旧车,削弱了结论.而且ABD都不靠谱~

117. 题中说那种抗生素antibiotics只能治疗细菌感染bacteria infection,不能治疗病毒感染virus infection.矛盾是被病毒感染的小孩的受感染的中耳可以用上文说的抗生素治好.这里有个缺陷,就是那些小孩的中耳究竟是bacteria infection,还是virus infection.

而B,恰好补了这个缺陷,说小孩的中耳是bacteria infection,因此能用那种抗生素治好.

D说大多数病毒感染比细菌感染难治,不能解释那个矛盾

thank you so much, i am not scrupulous enough.