小女子求助。。望指点一二。。。。

hellocrystal

5. Although the ratio of physicians to totalpopulation is about the same in the United States and Canada, the United Stateshas 33 percent more surgeons per capita. Clearly, this is the reason people inthe United States undergo 40 percent more operations per capita than doCanadians.
Theexplanation given above rests on an assumption that
(A) patientsin the United States do not have a greater need for surgery than do patients inCanada.（取非后加强）　　　　　他因削弱
(B) the population of the United States isnot larger than that of Canada. （百分比与数量要分清）
(C) United States patients sometimes travelto Canada for certain kinds of surgery.
(D) general practitioners in the UnitedStates do not as a rule examine a patient who is a candidate for surgery beforesending the patient to a surgeon.
(E)there are no unnecessary surgical operations performed in Canada.
我选的是E，答案是A，总是想不明白啊，请高人指点啊




4. Which ofthe following best completes the passage below?
Sales campaigns aimed at the falteringpersonal computer market have strongly emphasized ease of use, calleduser-friendliness. This emphasis is oddly premature and irrelevant in the eyesof most potential buyers, who are trying to address the logically prior issue of whether______.
(A)user-friendliness also implies that owners can service their own computers

(B) personal computers cost more the moreuser-friendly they are
(C) currently available models areuser-friendly enough to suit them
(D) the people promoting personal computersuse them in their own homes
(E)they have enough sensible uses for a personal computer to justify the expenseof buying one


这道题，我愣是没看出来题目和答案有毛关系，请大家指点一二啊啊啊 a