政党由其代表的阶级中的一部分人所组成，他们是（） A.最富有的分子 B.最有文化的分

表达式STUFF(“GOODLUCK",5，4,"FOXPRO")的返回值是______。

若脓汁标本经涂片革兰染色镜检发现葡萄球菌，试问为确定该菌是否有致病性应该检查哪一种酶（）

A.血浆凝固酶

B.触酶

C.DNA酶

D.尿素酶

E.卵磷脂酶

关于睾丸的白膜的描述，正确的是 ( )

A．是一层浆膜

B．是一层疏松结缔组织膜

C．是一层纤维膜

D．沿睾丸后缘深入睾丸内立即形成许多睾丸小隔，将睾丸分成许多睾丸小叶

E．以上都不对

任务型阅读。请认真阅读下面短文，并根据所读内容在文章后表格中的空格里填上一个最恰当的单词。

注意：每个空格只填1个单词。

      This year, about 2,300 teenagers from all over the world will spend about 10 months in US homes. At the

same time about 1,300 American teenagers will go to other countries to learn new languages and learn the rest

of the world. 

      Here is a 2-way student exchange in action. Fred, 19, spent last year in Germany with George's family.

In turn, George's son Mike spent a year in Fred's home in America.

      Fred, a lively young man, knew little German when he arrived. But after 2 months of studying, the

language became easy for him. School was completely different from what he had expected and it was much

harder. Students rose respectfully when the teacher entered the room. They took 14 subjects instead of 6 that

were usually taken in the US.

      Family life, too, was different. The father's word was the law. All the activities were done with the family

rather than individually. Fred found the food to be too simple at first. He also missed having a car. 

     "Back home, you pick up some friends in a car and go out to have a good time. In Germany, you walk but

you soon learn to like it."

      At the same time, in America, Mike, a friendly German boy, was also forming his own ideas. "I suppose

I should criticize American schools." he says, "It is far too easy for our level but I have to say that I like it a

lot in Germany, we do nothing buy study. Here we take part in many other activities. I think that maybe

American schools are better in training their citizens. There ought to be some middle ground between the two."

      1______ between American school life and German school life Items (项目) American students German

students Class rules They don't have to stand up. They have to rise to show respect to their 2______. 3______

life They do their own things individually. They have to listen to their 4______. School 5______ They are very

6______ to learn. They are much more difficult. Going out They can 7______ cars. They have to 8______ all

the way. School activities They have 9______ other activities. They have to 10______ hard all the time.

在油气层中钻进，钻井液受到油气侵时，越靠近井口处，钻井液中（）。

A、含气量越高、钻井液密度越低

B、含气量越低、钻井液密度越低

C、含气量越高、钻井液密度越高

D、含气量越低、钻井液密度越高