时延指标直接反映了监控系统实时性的好坏程度。

0.96 g Mg跟含6.3gHNO₃的稀溶液恰好反应完全，则HNO₃还原产物的式量是：

A．30

B．44

C．46

D．80

Speaking two languages rather than just one has obvious practical benefits in an increasingly globalized world．But in recent years, scientists have begun to show that the advantages of bilingualism （双语能力） are even more important than being able to converse with a wider range of people．Being bilingual, it turns out, makes you smarter．It can have a deep effect on your brain, improving skills not related to language and even protecting against a serious mental disorder in old age．

This view of bilingualism is different from the understanding of bilingualism through much of the 20th century．Researchers, educators and policy makers long considered a second language to be an interruption that prevented a child's school work and ability to think and understand things．They were not wrong about the interruption: there is ample evidence that in a bilingual \s brain both language systems are active even when he is using only one language, thus creating situations in which one system disturbs the other．But this interruption, researchers are finding out, isn't so much a disturbance．It forces the brain to solve inside conflict, giving the mind a workout that strengthens its thinking muscles．

The key difference between bilinguals and monolinguals may be more basic: a heightened ability to monitor the environment．"Bilinguals have to switch languages quite often—you may talk to your father in one language and to your mother in another language," says Albert Costa, a researcher at the University of Pompea Fabra in Spain．

"It requires keeping track of changes around you in the same way that we monitor our surroundings when driving．" In a study comparing German-Italian bilinguals with Italian monolinguals on monitoring tasks, Mr．Costa and his colleagues found that the bilingual subjects not only performed better, but they also did so with less activity in parts of the brain involved in monitoring, showing that they did better in it．

小题1:From the passage we can learn that experts used to believe that ______．

A．interruption forced a bilingual's brain to strengthen its thinking ability

B．a second language stopped children's studying as well as mental development

C．using two languages annoyed the children who have trouble in learning skills

D．language systems were busy in a bilingual's brain when he was using languages小题2:The underlined word "switch" in Paragraph 3 probably means "______"．

A．change

B．use

C．speak

D．study小题3:What is the author's attitude towards bilingualism?

A．Cautious．

B．Doubtful．

C．Concerned．

D．Favourable．小题4:Which of the following would be the best title for the passage?

A．How Bilinguals Use Languages

B．What Bilingualism Is Really about

C．Why Bilinguals Are More Intelligent

D．When People Learn a Second Language

药物作用的强弱取决于（）

A．吸收速度

B．消除速度

C．代谢速度

D．排泄速度

E．效能

读“田纳西河流域示意图”，完成3题。

小题1:下列哪个选项不是治理前田纳西河流域多洪水的原因：

A．过度垦殖，滥伐森林

B．冬春季节降水多

C．航运发达

D．下游为平原，排水不畅小题2:田纳西河流域管理局(TVA)在“统一管理，综合开发”的过程中，将下列哪个因素作为流域开发的核心：

A．河流的梯级开发     

B．流域内农业的多种经营 

C．土地资源利用率及高耗能工业           

D．流域内的矿产开发

小题3:田纳西河流域工业走廊的形成，主要是因为

A．修大坝，使通航条件大为改善

B．防治污染，提高田纳西河的水质

C．旅游业带来经济收入

D．大规模的水电开发，促进了高耗能工业的发展

改编自顾漫同名小说的爱情电影，由乐视影业（北京）有限公司出品，杨文军、黄斌执导，黄晓明、杨幂、佟大为、angelababy、谢依霖、何穗、黄子韬等主演。该片主要讲述何以琛和赵默笙通过一段年少时的爱恋牵出一生的纠缠，一个执着于等待和相爱的故事影片定档于2015年5月1日上映，这电影叫什么？