患者，男，42岁。4年来经常腹胀，下肢浮肿。查体：前胸有蜘蛛痣，有腹水，肝未触及，脾

为探究pH对唾液淀粉酶活性的影响，某同学分别向A～E5支试管中加入适宜浓度的唾液淀粉酶2mL，调节各试管的pH如下表，再分别加入质量分数为2%的淀粉液2mL。37℃保温10min后，加入斐林试剂或本尼迪特试剂显色结果如下表。请回答问题：

(1)在本实验中，斐林试剂或本尼迪特试剂检测的物质是_________。

(2)实验结果表明淀粉酶的最适pH是_____________，高于或低于此pH时，酶活性_____________。

(3)如果将实验中的淀粉液换成相同浓度的蔗糖溶液，其他条件不变，不能出现砖红色沉淀，原因是淀粉酶不能催化_________的水解反应，说明酶具有_____________。

汉密尔顿量表适用于有抑郁症状的（）。

A.儿童病人

B.青年病人

C.成年病人

D.老年病人

下边漫画中人物的言行告诉我们[ ]

A．对他人讲客套话，是虚伪的表现

B．在公共场所，要学会拒绝和远离

C．一句客气话可以化解人生一切麻烦

D．只有懂得尊重他人的人，才能得到他人的尊重

We live in a digital world now, and a student's technology needs have changed. For the early years, say when you are in primary school, you can get by with no technology at all. Even if you have a computer, it's a good idea to get children familiar with libraries. At this age, trips to the library are like family outings.

As you get closer to middle school, a computer with Internet access becomes more of a necessity. Teachers will often give assignments that require a student to use the Internet for research. After a computer, technology choices for students become more difficult to make – especially when it comes to cell-phones. Kids will beg their parents for a cell-phone, especially in middle school. For many parents, it's a safety issue: They want to know that their kids can reach them quickly if necessary. For teachers, cell phones can be used to record lessons when students are absent. But many teachers dislike cell-phones. Some kids send messages or have talks in the class. Sending messages also raises the problem of cheating on exams. More and more schools are now forbidding the use of cell-phones.

Many kids see iPods as necessary things to have. iPods are great for music, but do they do anything good for your children’s education? Maybe they do. That’s the opinion of Doug Johnson, an educator for 30 years. Johnson says that educators should accept all new forms of technology in the classroom, including iPods. “Some do more with their cell- phones than we can do with our laptops,” he jokes. “I don’t think we should be afraid. The truth is that it’s easier to change the way we teach than to change the technology habits of an entire generation.”

1. According to author, primary school children should___.

A. use the computer and the Internet regularly      B. ask their parents to buy them cell-phones

C. buy iPods to listen to music                  D. go to libraries to read more books

2. Why do parents agree to buy their children cell-phones?

A. They want their children to be cool.

B. They think cell-phones be helpful to their study.

C. They want to keep in touch with their children.

D. They want their children to keep up to date.

3. The following are all reasons why many teachers dislike cell-phones EXCEPT ____.

A. cell-phones can be used to cheat on exams   

B. schoolchildren will send messages during class

C. cell-phones can be used to record lessons    

D. schoolchildren might talk on them during class

4. What does the underlined word “that” refers to?

A. iPods can be used to listen to music.      

B. iPods can be helpful for children’s education.

C. iPods can be used to play games.            

D. iPods are necessary for children’s lives.

5. We can infer from what Doug Johnson said that _____.

A. cell-phones are not useful to students        

B. teachers should let students use cell-phones

C. it’s better for teachers to change their teaching methods

D. schoolchildren should follow the trends(潮流) of fashion

试述胸膜腔穿刺的部位和层次。