问题 单项选择题

香蕉叶斑病是一种严重影响香蕉树生长的传染病,它的危害范围遍及全球。这种疾病可由二种专门的杀菌剂有效控制,但喷洒这种杀菌剂会对周边人群的健康造成危害。因此,在人口集中的地区对小块香蕉林喷洒这种杀菌剂是不妥当的。幸亏规模香蕉种植园大都远离人口集中的地区;可以安全地使用这种杀菌剂。因此,全世界的香蕉产量,大部分不会受到香蕉叶斑病的影响。 以下哪项最可能是上述论证所假设的( )

A.香蕉叶斑病不危害其他植物

B.全世界生产的香蕉,大部分产自规模香蕉种植园

C.和在小块香蕉林中相比,香蕉叶斑病在规模香蕉种植园中传播得较慢

D.香蕉叶斑病是全球范围内唯一危害香蕉生长的传染病

答案

参考答案:B

解析: 结论是:全世界的香蕉产量大部分不会受到香蕉叶斑病的影,响。其根据是:规模香蕉种植园大都可以不危害人群,安全使用能有效控制香蕉叶斑病的杀菌剂。为使这一论证有说服力,显然需要假设:全世界生产的香蕉,大部分产自规模香蕉种植园。如果大部分香蕉不是来自种植园,则其产量和能使用杀菌剂的香蕉园就没有很大的关联性了。故选B。

单项选择题
单项选择题

Are teens and young adults more narcissistic (自恋的) today than in the past That’s the view of a California researcher who studies (1) people.

In her new book, The Narcissism (2) : Living in the Age of Entitlement, psychologist Jean Twenge of San Diego State University and (3) W. Keith Campbell of the University of Georgia say research shows (4) young people today have "narcissistic traits" than in (5) generations. Such traits, Twenge says, include a very. (6) and inflated sense of self, which is (7) by a preoccupation with MySpace, Facebook and YouTube.

"We’ve been on this self-admiration cultural (8) for a long time," Twenge says. (9) Twenge’s take on today’s young people isn’t universal. Studies by other researchers, including Canadian (10) Dr. Kali of the University of Western Ontario, have used the same data but found (11) results. "They put a different (12) on it," Kali says.

Twenge’s studies have found more narcissistic traits and a (13) rate of increase among college students today, but Kali found that students’ narcissism was (14) greater in 2006 than in 1976. Twenge’s most recent paper studied the same data as Kali--more than 20 000 college students from 2002 to 2007. (15) researchers used the Narcissistic Personality Inventory to measure narcissistic (16) and findings by both have been (17) in peerreviewed journals.

Twenge’s book (18) just a month after The Mirror Effect : How Celebrity Narcissism Is Seducing America, a book co-written by behavioral (19) Drew Pinsky, (20) suggested that a celebrity-obsessed culture is causing more narcissism.

1()

A.old

B.changeable

C.young

D.depressed