在一定量的稀盐酸中加入固体氢氧化铝片,反应的过程用下列图示表示正确的是[ ] A

题型:选择题

问题:

在一定量的稀盐酸中加入固体氢氧化铝片,反应的过程用下列图示表示正确的是[ ]

A.

B.

C.

D.

考点:酸的性质
题型:选择题

下列说法正确的是

A.钙铁锌是人体的微量元素

B.血红蛋白与CO结合的能力比与O2的结合能力强

C.缺碘易产生龋齿

D.缺乏维生素C对人体没有影响

题型:选择题

带下过少的临床表现可见()

A. * * 干涩,甚则阴部萎缩

B.性欲低下,性交疼痛

C.烘热汗出

D.闭经

E.不孕

题型:选择题

政策性金融机构为企业或政府提供金融与非金融服务的职能是( )

A.服务性职能
B.倡导性职能
C.补充性职能
D.选择性职能

题型:选择题

Children start out as natural scientists, eager to look into the world around them. Helping them enjoy science can be easy ;there’s no need for a lot of scientific terms or expensive lab equipment. You only have to share your children’s curiosity. Firstly,listen to their questions. I once visited a classroom of seven-year-olds to talk about science as a job. The children asked me" textbook questions" about schooling, salary and whether I liked my job. When I finished answering, we sat facing one another in silence. Finally I said, "Now that we’ve finished with your lists, do you have questions of your own about science"
After a long pause ,a boy raised his hand," Have you ever seen a grasshopper(蚱蜢) eat When I try eating leaves like that, I get a stomachache. Why"
This began a set of questions that lasted nearly two hours.
Secondly, give them time to think. Studies over the past 30 years have shown that, after asking a question, adults typically wait only one second or less tor an answer, no time for a child to think. When adults increase their" wait time" to three seconds or more, children give more logical, complete and creative answers.
Thirdly, watch your language. Once you have a child involved in a science discussion, don’t jump in with" That’s right" or" Very good". These words work well when it comes to encouraging good behavior. But in talking about science, quick praise can signal that discussion is over. Instead, keep things going by saying" That’s interesting" or" I’d never thought of it that way- before", or coming up with more questions or ideas.
Never push a child to" Think". It doesn’t make sense, children are always thinking, without your telling them to. What’s more, this can turn a conversation into a performance. The child will try to find the answer you want, in as few words as possible, so that he will be a smaller target for your disagreement.
Lastly, show;don’t tell. Real-life impressions of nature are far more impressive than any lesson children can learn from a book or a television program. Let children look at their fingertips through a magnifying glass, and they’ll understand why you want them to wash before dinner. Rather than saying that water evaporates, set a pot of water to boil and let them watch the water level drop.

According to the passage, children are natural scientists, and to raise their interest, the most important thing for adults to do is______.

A. to let them see the world around
B. to share the children’s curiosity
C. to explain difficult phrases about science
D. to supply the children with lab equipment

题型:选择题

肱骨外科颈骨折多发于()

A.小儿

B.20岁以下

C.青壮年

D.50岁以上

E.50岁以下

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