随着每单位可变投入的增加，当（）时，报酬递减规律发生作用。
A. 总产出开始下降
B. 边际物质产品变为负数
C. 边际物质产出开始下降
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A型题 混悬剂中药物粒子的大小一般为
A. ＜0.1nm
B. ＜1nm
C. ＜10nm
D. ＜100nm
E. 500nm～1000nm
IMPERMEABLE:
A. dusty
B. porous
C. spongy
D. candid
E. glutinous
It was purely through a gift for nuance that Kempton noticed, while reviewing the work of Whittaker Chambers, something______authentic beneath the______and self-pity.
A. suspiciously … charm
B. negligibly… erudition
C. conspicuously … rue
D. undeniably… bombast
E. spuriously … braggadocio
Which of the following is most nearly analogous in its cause and condition to the problems which the author describes as limiting the present success of African- American cinema
A rock-and-roll band considers its music unappealing to a mainstream audience, changes to a more palatable sound, and fails anyway.
B. An author decides that he would have a better niche in a fringe literary market, and sells his work there, but with little profit.
C. An artist decides that his oeuvre of paintings is not commercially viable, and resigns himself to make unpopular but artistically dignified work.
D. A marketing executive decides that a product won't sell, and thus restricts its availability to a certain loyal market.
E. A film actor realizes that he could be more successful working in theater, and though he achieves success, finds he misses his old form
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