防止鱼类浮头和泛池的方法?

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问题:

防止鱼类浮头和泛池的方法?

考点:水产学池塘养鱼池塘养鱼题库
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There are about fifteen hundred languages in the world. But only a few of them are very important. English is one of them. Many, many people use it, not only in England and the USA, but also in other parts of the world. About 200,000,000 people speak it as their own language. It is difficult to say how many people are learning it as a foreign language. Many millions of people are trying to do so. Is it easy or difficult to learn English? Different people may have different answers. Have you ever noticed ads(广告) of this kind in the newspapers or magazines? “Learn English in six weeks, or give your money back…” “Easy and funny…” “Our records and tapes help you master English in a month”. Of course, it never happened quite like that.

The only language that seems easy to learn is the mother tongue. We should remember that we all learned our own language well when we were children. If we could learn English in the same way, it would not seem so difficult. Think of what a small child does. He listens to what people say. He tries what he hears.

So it is hard to say that learning English is easy. We must do a lot of practice. And practice needs great efforts and takes much time. Good teachers, record, tapes, books, and dictionaries will be helpful, but they cannot do the student’s work for him.

小题1:How many languages are very important in the world?

A.A few

B.Few

C.About 1500

D.Many小题2:If we want to learn English well, what shall we do?

A.We should study it without any help.

B.We must do a lot of practice.

C.We need to get much money back.

D.We must live in England or America.小题3:How does the writer like the ads in the newspapers or magazines?

A.He thinks the ads very expensive.

B.He thinks the ads are true.

C.It never happened quite like what the ads said.

D.He believes” Learn English in six weeks, or give your money back”.小题4:Which language is easy to learn?

A.English

B.Chinese

C.Japanese

D.The mother language小题5:Which countries use English as the mother tongue?

A.China and France

B.Japan and Italy

C.England the America

D.Germany and France

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若一个身高1.6m的人站在竖直挂置的大穿衣镜前0.5m处,则此人在镜中的像高是______m,若此人远离平面镜,则像的大小_______(选填:“变大”、“变小”、“不变”)。

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2010年上海世博会于5月1日至10月31日举行,主办机构预计将吸引世界各地7000万人次参观者前往,旅游、商贸、交通、通讯、传媒、宾馆、餐饮等行业将受益,并且这些行业将进一步拉动国民经济增长。这是因为  [ ]

A.生产方式决定消费的方式

B.消费是生产的最终目的

C.消费热点带动相关产业的发展

D.生产是消费的目的

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吴越历史舞台的中心在哪里,多年以来一直是学者与公众共同关注的焦点。尽管古籍文献对此有所(),但是多(),有的虽言之凿凿却只是演义。

A.论证浮光掠影

B.涉及穿凿附会

C.记载语焉不详

D.描述轻描淡写

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温度刺激出现疼痛,但刺激去除后疼痛即可消失,可能为

A.牙髓正常
B.牙髓坏死
C.可复性牙髓炎
D.牙髓钙化
E.慢性牙髓炎

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