问题 选择题

植物在缺氮的情况下,生长迟缓、叶色发黄.这时需施用的化肥是(  )

A.KCl

B.NH4HCO3

C.K2CO3

D.Ca(H2PO42

答案

植物在缺氮的情况下,生长迟缓、叶色发黄.这时需施用的化肥是氮肥.

A、氯化钾中不含有氮元素,不属于氮肥;

B、碳酸氢铵中含有氮元素,属于氮肥;

C、碳酸钾中不含有氮元素,不属于氮肥;

D、磷酸二氢钙中不含有氮元素,不属于氮肥.

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.

10()

A.psychologist

B.archaeologist

C.philosopher

D.physicist