写出带有下列偏旁的字。 雨（）　（）　（） 辶（）　（）　（） 氵（）　（）　（

Swimming and English Learning

Can you swim? Do you like swimming? Yes? Well, how can you learn to swim? I think the best way is to go into the water and learn. I’m afraid you’ll never learn to swim just by reading books about swimming or looking at others swimming. It’s the same with the English study. We must practice, practice and practice.

Listening and speaking are very important for beginners. The children in English-speaking countries first listen to others. Then they try to imitate and speak. We can listen to English programs on radio. You may just understand a few words. It doesn’t matter. Just be relaxed, try to catch every word.

Somebody may be a good listener. But he dare not speak. He’s afraid of making mistakes. You know we sometimes make mistakes when we speak Chinese. Don’t be afraid. We must be brave（勇敢）. If you really want to learn English well, you must try to speak with everyone so long as he knows English. Whether you know him or not is not important when there’s nobody to talk with, you can talk to yourself in English. It’s interesting and also a good way to practice your spoken English. Remember, the more you speak, the fewer mistakes you’ll make.

Reading and writing are more important for senior school students. First we must choose the books we’re interested in. A lot of reading will improve your language sense. This is the most important.

Keep writing English diaries. We can also write English articles. You may even post them to English magazines. Don’t be afraid of failure. Failure is the mother of success.

Easier said than done. Well, let’s do more practice from now on. I’m sure you’ll learn English well in this way.

(   ) 6. You can learn to swim by_______.

A. reading books about it  B. looking at others swimming

C. having lessons on it    D. going into the river and learning

(   ) 7. We should learn English by _______.

A. listening and speaking       B. reading and writing

C. A and B                  D. swimming

(   ) 8. What will you do with mistakes when you speak?

A. Don’t make mistakes.          B. Study hard

C. Try not to speak English        D. Don’t be afraid.

(   )9. What’s more important for senior school students?

A. listening    B. speaking    C. reading and writing   D. learning

(   ) 10. We can listen to English ______, according to the passage.

A. by train     B. on the radio   C. every minute   D. now and then

在现况研究中，被抽中的调查对象没有得到应答而产生的偏倚为

A．信息偏倚

B．混杂偏倚

C．失访偏倚

D．报告偏倚

E．无应答偏倚

某中学化学兴趣小组的同学欲通过实验探究，验证粗盐中杂质的种类和NaCl的含量．

探究一：这包粗盐中还有什么杂质？

提出问题：粗盐中可能含有较多的CaCl₂，请你设计实验验证杂质的成分？

操作步骤	实验现象	实验结论
______	______	______

探究二：这包粗盐中NaCl的质量分数是多少？

小凡同学按下面的步骤继续进行了实验，请你帮他补充完整．

①称取一定质量的样品（质量为Wg）

②将样品加水溶解，制成粗盐溶液

③向粗盐溶液中加入过量的某种试剂，过滤

④沉淀洗涤后小心烘干，得到固体A

⑤向滤液中滴加适量的稀盐酸后，进行某一操作，即可得到纯净的固体B

⑥称量实验中得到的某种固体的质量

（1）在②③⑤的步骤中，都使用到一种仪器是______，它在步骤②和⑤中的操作方法相同．但目的不同，其目的分别是______、______．

（2）步骤⑤进行的“某一操作”是______，所需要的主要实验仪器有______，该操作中加入稀盐酸的目的是______．

（3）步骤⑥中，你认为需称量固体A还是固体B的质量．______，你不选择称量另一种固体的理由是：______．

养生学专家建议青少年要适当多吃奶、蛋、鱼、肉等富含蛋白质的食品。这是因为蛋白质是 [ ]

A．细胞的重要组成成分    

B．主要的供能物质  

C．主要的贮能物质    

D．溶解养分的物质

能验证暴露因素与疾病之间因果关联的研究类型是（）。

A.筛查

B.现况研究

C.队列研究

D.生态学研究

E.病例对照研究