我们所要建设的社会主义和谐社会的基本特征是______ A．民主法治、公平正义 B

关于癫痫小发作正确的是()

A．多在20岁以后发病

B．失神小发作时意识可清楚

C．可伴简单自动性动作

D．发作持续时间可达5分钟

E．发作脑电图呈单侧3Hz棘—慢波综合征

某河道两旁有甲、乙两厂。它们排放的工业废水中，共含K⁺，Ag⁺，Fe³⁺，Cl^-，OH^-，NO₃^-6种离子。甲厂的废水明显呈碱性，甲厂废水中含有的3种离子是______，______，______ 。乙厂的废水中含有另3种离子。如果加一定量_____（填“活性炭”、“硫酸亚铁”或“铁粉”），可以回收其中的金属______（填金属元素符号）。另一种设想是将甲厂和乙厂的废水按适当的比例混合，可以使废水中的______（填写离子符号）转化为沉淀。经过滤后的废水主要含______，可用来浇灌农田。

It’s been claimed that playing a musical instrument makes you smarter．

New research suggests that regularly playing a musical instrument changes the shape and power of the brain, and may be used in therapy (疗法) to improve cognitive (认知) skills．

Experts say there is growing evidence that musicians have brains that are structurally and functionally different from those of non-musicians, especially in the areas of the brain used in processing (处理信息)

The parts of the brain that control motor skills, the storage of audio information, hearing and memory become larger and more active when a person learns how to play an instrument and can apparently improve the alertness (警觉) and planning．

Lutz Jancke, a psychologist at the University of Zurich, said, “Leaning to play a musical instrument has great benefits and can increase IQ by seven points in both children and adults．We found that even people over the age of 65, after four or five months of playing an instrument for an hour a week, had strong changes in the brain.” The parts of the brain that control hearing and memory, and the part that controls the hands, among others, all become more active.

“Of course music isn’t the only answer, but I do believe that it should be used in addition to other things.”

Mr．Jancke also said that learning a musical instrument could also make it easier to learn foreign languages and make one more sensitive to understanding the emotions of others．“So not only does this make it easier to pick up other languages and have a better memory of one’s own, we have also seen musicians are able to pick out exactly what others are feeling just by the tones of their voices—sympathy, disappointment, that kind of things.”

He added, “Several studies indeed show that playing music increases memory and language skills, but more research is needed.”

1．What is the passage mainly about?

A．How to use musical instruments.

B．How music affects the brain.

C．How playing music makes people smarter.

D．The development of research into music.

2．Compared with non-musicians, __________.

A．musicians are better at foreign languages

B．musicians are more active in sports

C．musicians have stronger emotions

D．musicians’ brains work differently in processing

3．Which of the following is NOT a benefit of playing an instrument?

A．It makes it easier for one to pick up foreign languages.

B．It allows one to show his feelings more exactly to others．

C．It gives one a better memory in one’s own language．

D．it makes one understand others’ feelings better．

4．From Luz Jancke we lean that _________．

A．playing an instrument benefits children more than adults

B．playing an instrument has no benefits for people over 65

C．some studies show playing music can increase memory

D．he will do more research into brain development and music

患者男，12岁，正在进行正畸治疗，医生建议他使用氟化凝胶防龋。

目前普遍使用的氟化凝胶的含氟成分是（）

A.氟化钠

B.氟化亚锡

C.酸性磷酸氟

D.氟化胺

E.单氟磷酸钠

下列关于MX20系统子架级联说法错误的是（）

A、主从子架的子架号必须不同。

B、在合并VLAN的情况下，不能连接成环，不然就会广播风暴。

C、GE口连接是子架级联的，可以用GE口把两个网元之间的电源板连接起来。

D、如果采用36芯电缆一定要插牢。