问题 单项选择题

某社团共有46人,其中35人爱好戏剧,30人爱好体育,38人爱好写作,40人爱好收藏,问这个社团至少有多少人以上四项活动都喜欢( )

A.5
B.6
C.7
D.8

答案

参考答案:A

解析: 该题需要逆向思考。由题意可知,不喜欢戏剧的有11人,不喜欢体育的有16人,不喜欢写作的有8人,不喜欢收藏的有6人,只有当这4个集合相互没有交集时,才能得出四项活动都喜欢的最少人数。故46-(11+16+8+6)=5(人),正确答案为A。

填空题
单项选择题

Research on animal intelligence always makes me wonder just how smart humans are. (91) the fruitfly experiments described in Carl Zimmer’s piece in the Science Times on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly (92) to live shorter lives. This suggests that (93) bulbs burn longer, that there is an (94) in not being too terrifically bright.
Intelligence, it (95) , is a high-priced option. It takes more upkeep, burns more fuel and is slow (96) the starting line because it depends on learning—a gradual (97) —instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (98) .
Is there an adaptive value to (99) intelligence That’s the question behind this new research. I like it. Instead of casting a wistful glance (100) at all the species we’ve left in the dust I.Q. wise, it implicitly asks what the real (101) of our own intelligence might be. This is (102) the mind of every animal I’ve ever met.
Research on animal intelligence also makes me wonder what experiments animals would (103) on humans if they had the chance. Every cat with an owner, (104) , is running a small-scale study in operant conditioning, we believe that (105) animals ran the labs, they would test us to (106) the limits of our patience, our faithfulness, our memory for terrain. They would try to decide what intelligence in humans is really (107) , not merely how much of it there is. (108) , they would hope to study a (109) question. Are humans actually aware of the world they live in (110) the results are inconclusive.

A.fight

B.doubt

C.stop

D.think