如果有两个质数的和等于21,这两个数可能是______和______.

题型:填空题

问题:

如果有两个质数的和等于21,这两个数可能是______和______.

考点:质数,互质数,分解质因数,合数
题型:填空题

请为下面新闻拟个恰当地标题。(15字以内)(5分)

12月10日 上午,西京医院骨科全体医护人员发出了一份捐款倡议书,倡议向骨肿瘤科硕士研究生黄晨捐款。黄晨从山西一家市级医院辞职后被录取为第四军医大学的地方研究生,他因患急进性肾小球炎,病情危重,需要多次血浆置换及血液透析,但他本人无收入又没医保,急需用钱。倡议书贴出后,人们很快排起长队,排队的除了医护人员,还有很多患者及家属。短短4个小时,为黄医生筹款3.4万元,虽然患者和家属的捐款所占份额不多,但还是令现场的医生和护士非常感动。

                                                                                                         

题型:填空题

阅读理解。

      A good way to pass an exam is to work hard every day in a year. You may fail in the exam if you are lazy

(懒惰) for most of the year and then work hard only a few days before the exam. If you are taking an English

exam, do not only learn rules of grammar. Try to read stories in English. Speak in English whenever you can.

A few days before the exam you should go to bed early. Do not stay up late studying. Before you start the exam,

read carefully over the question paper, try to understand the exact (确切的) meaning of each question. When

you have at last finished your exam, read over your answers. Correct (改正) the mistakes if there are any, and

be sure that you have not missed anything out.

1. How can we do well in exams? [ ]

A. We should work hard every day in the year.

B. We should go to bed early a few days before an exam.

C. We should read over the answers before we hand in our papers.

D. We should do A, B, C.

2. Learning rules of grammar ________ to pass an exam. [ ]

A. is enough

B. is not enough

C. is not impossible

D. is no use

3. Speak in English whenever you can. It is _______ to your English study. [ ]

A. helpful

B. impossible

C. wonderful

D. foolish

4. Make sure that you _______ before you hand in your paper. [ ]

A. remember rules of grammar

B. have thought over and over again

C. have answered all the questions

D. have read stories in English

5. In the sentence "Do not stay up late at night studying", the expression "stay up" means _______. [ ]

A. 逗留

B. 呆坐

C. 熬夜

D. 停止

题型:填空题

挠性固定

题型:填空题

地球上终年炎热的地区是(    )

A.温带地区

B.两极地区

C.高山地区

D.赤道地区

题型:填空题

下列句子无语病的一句是

[ ]

A.老师那和蔼可亲的笑脸和谆谆教导常浮现在我眼前。

B.多读多写是正确提高写作水平的途径。

C.鲁迅先生从事无产阶级文学事业30年,视时间看作生命,笔耕不缀。

D.在延安,美德观念有更健康的内容,那就是整洁﹑朴素﹑自然。

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