单选题 The dramatic rise in the number of homeless people in the 1980's cannot be attributed to the discharge of mentally ill persons from hospitals into "community care." even though it is true that provisions for such community care are for the most part nonexistent.
Which of the following, if true, best supports the claim above?

A、 The policy of discharging mentally ill persons from hospitals was based on the supposition that their illnesses couldbe controlled by newly developed drugs.
B、 Without supervision in a hospital setting those people whose mental illness can be controlled by medication might not actually take prescribed medication.
C、 Some community-care programs for mentally ill persons did exist in the 1980's, but those programs consisted primarily of outpatient clinics.
D、 The policy of discharging significant numbers of mentally ill persons from hospitals took effect in the 1960's.
E、 (E) There have always been some people in large cities who have led a homeless existence.

【正确答案】 D

【答案解析】[解析] 本题让我们寻求一个选项支持“20世纪80年代无家可归人数的急剧增加不能归因于将精神病人从医院推向社区护理”。若这一政策在20世纪60年代已实施了，那么无家可归人数的增加应从60年代就开始了，所以现在80年代无家可归人数的剧增必定是由其他原因导致的，所以(D)支持了段落论述，因此(D)正确；(A)易误选，但由于这只是这项政策所基于的假设，这个假设是否成立我们并不知道，所以起不到任何作用；(B)起到了反对作用；(C)、(E)与推理无关。