下列说法中正确的是（ ） A．原子核内质子和中子的个数是相等的 B．物质由分子或

根据短文内容及首字母提示，填写所缺单词。

Children are amazing! They pick up languages so naturally and easily. Have you ever wondered why? It’s not because they have great natural language abilities. In fact, studies s 小题1:  that an adult’s potential(潜能) to learn language is just as good as a child’s .

So why do children still s 小题2:  to acquire(学到) language more quickly than the rest of us? It’s because of the way they learn. Children learn by simply d 小题3: what comes naturally—they listen, copy and communicate. Let’s take a c 小题4:  look at how children acquire language. Perhaps we can discover a better, more “natural” way to learn English.

Children don’t practice grammar drills, but u 小题5:  language to talk about things that interest them. This helps them learn to express themselves. They don’t w 小题6:  about inadequate(不足的) vocabulary or poor grammar. They find w 小题7: to express themselves, and they do it successfully.

Students of English should also pay more attention to genuine(真实的) communication. Look for chances to talk with people in English. If you can’t find a foreigner to talk to, talk with other English students i 小题8:. Start an English discussion group and chat about music, movies or whatever interests you.

Don’t worry about m 小题9:  mistakes. The aim is to learn how to communicate easily and comfortably. Remember that you can communicate successfully even with a small vocabulary.

Trust your own natural a 小题10:  to learn English. You’ve got more potential than you probably realize!

测定一小分子抗原应选用的ELISA方法是（）

A.双抗体夹心法

B.双抗原夹心法

C.抗原竞争法

D.捕获法

E.抗体竞争法

一般把原油中蜡的质量含量小于（）成为低蜡原油。

A、1%

B、3%

C、5%

D、2.5%

下列关于计算机病毒的叙述中，正确的是

A．所有计算机病毒只在可执行文件中传染

B．计算机病毒可通过读写移动硬盘或Internet络进行传播

C．只要把带毒优盘设置成只读状态，盘上的病毒就不会因读盘而传染给另一台计算机

D．清除病毒的最简单的方法是删除已感染病毒的文件

组织