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问题 多项选择题

20世纪90年代后期，我国的改革开放和现代化建设事业经受了一系列严峻考验，其中有( )

A．亚洲金融危机的冲击

B．长江等流域发生历史上罕见的洪涝灾害

C．台湾地区领导人李登辉抛出“两国论”

D．以美国为首的北大西洋公约集团轰炸中国驻南斯拉夫大使馆

答案

参考答案：A,B,C,D

解析： 1997年，亚洲发生金融危机；1998年，长江、松花江、嫩江流域发生了百年不遇的洪水；1999年7月李登辉接受某国电台采访时抛出“两国论”；1999年5月，美国轰炸了中国驻南斯拉夫大使馆。

多项选择题

有关结核菌素试验的说法，下列哪项是错误的（）

A.结核菌素试验阳性，可确定有结核病

B.结核菌素试验阴性，可排除有结核病

C.结核病治愈后，结核菌素试验可由阳转阴

D.初次感染结核2周后，结核菌素试验可由阴转阳

E.机体免疫反应受到抑制结核菌素试验可阴性
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单项选择题

Research on animal intelligence always makes us wonder just how smart humans are. (1) the fruit-fly experiments described by Carl Zimmer in the Science Times. Fruit flies who were taught to be smarter than the average fruit fly (2) to live shorter lives. This suggests that (3) bulbs burn longer, that there is a(n) (4) in not being too bright.

Intelligence, it (5) , is a high-priced option. It takes more upkeep, burns more fuel and is slow (6) the starting line because it depends on learning — a(n) (7) process — instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (8) .

Is there an adaptive value to (9) intelligence That’s the question behind this new research. Instead of casting a wistful glance (10) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (11) of our own intelligence might be. This is (12) the mind of every animal we’ve ever met.

Research on animal intelligence also makes us wonder what experiments animals would (13) on humans if they had the chance. Every cat with an owner, (14) , is running a small-scale study in operant conditioning. We believe that (15) animals ran the labs, they would test us to (16) the limits of our patience, our faithfulness, our memory for locations. They would try to decide what intelligence in humans is really (17) , not merely how much of it there is. (18) , they would hope to study a(n) (19) question: Are humans actually aware of the world they live in (20) the results are inconclusive.

6（）

A.off

B.behind

C.over

D.along
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