问题 单项选择题 A型题

下列关于生态系统物质循环和能量流动的叙述中,正确的是()。

A.使用粪便作肥料,其能量可以流向植物,实现了对能量的多级利用

B.碳在生物群落与无机环境之间的循环主要是以CO2的形式进行的

C.物质是能量的载体,生态系统的能量是伴随物质而循环利用的

D.食物链中初级消费者数量越多,次级消费者能够获得的能量就越少

答案

参考答案:B

解析:

粪便中的能量流向分解者,植物不能利用,A错误;植物光合作用吸收CO2,生物呼吸作用释放CO2,碳在生物群落与无机环境之间的循环主要是以CO2的形式进行,B正确;能量流动是单向的,不能循环利用,C错误;食物链中初级消费者数量越多,下一营养级获得的能量越多,D错误。

填空题
填空题

Exercising to music pumps up brain power


If music makes you smarter, and exercise helps brain function, can exercising to music really boost brainpower Some researchers said it can. Volunteers who listened to Vivaldi’s "Four Seasons" while working out on a treadmill did much better on a test of (1) ability than when they exercised without music, a team (2) Ohio State University found.
"Evidence suggests that exercise improves the (3) performance of people with coronary artery (4) ," said psychologist Charles Emery, who led the study.
"And listening to music is (5) to enhance brainpower. We wanted to put the two results together," Emery (6) in a statement.
Writing in the latest issue of the journal Heart & Lung, Emery and (7) said they studied 33 men and women taking (8) in a cardiac rehabilitation program after having bypass (9) , angioplasty or other procedures to treat clogged arteries.
The (10) said they felt better emotionally and mentally after working out (11) or without the music. But their improvement on the (12) fluency test doubled after listening to music on the treadmills.
"Exercise seems to (13) positive changes in the nervous system, and these changes may have a (14) effect on cognitive ability," Emery said.
"Listening to music may (15) cognitive function through different pathways in the brain. The combination of music (16) exercise may stimulate and increase cognitive arousal (17) helping to organize cognitive output."
Emery said he now wanted to (18) people using music of their own choice. "We used the ’Four Seasons’ because of its (19) tempo and positive effects on medical patients in previous (20) ," Emery said. "But given the range of music preferences among patients, it’s especially important to evaluate the influence of other types of music on cognitive outcomes.\