关于膀胱的描述，正确的是（） A.属腹膜外位器官 B.其最下部为膀胱底 C.黏膜上皮

阅读理解。

    PDAs are very useful. They are like small computers. You can put a lot of information into them. For

example, you can put in the telephone and e-mail addresses. Many people use PDAs to remember important

dates. Some of these super machines can even send and receive e-mails.

    PDAs are small and convenient. A few years ago, they were expensive. Now, they are cheap. Many

people use them at work and at school. People can carry PDAs in their pockets.

    But, it's important to be careful. These little machines are easy to lose (丢失). People put such important

information into their PDAs. It's really terrible to lose them.

1. What's the main idea of the passage? [ ]

A. PDAs are like small computers.

B. You can do many things with a PDA.

C. PDAs are cheap.

D. Too many people use PDAs.

2. The passage does not say a PDA can ______.[ ]

A. send e-mails

B. remember information

C. talk to you

D. do some things like a computer

3. What do we learn about PDAs? [ ]

A. Students don't like to use them.

B. All of them can send and receive e-mails.

C. They are very large.

D. They aren't very expensive.

4. Losing a PDA is a ______ experience (经历). [ ]

A. great

B. fine

C. strange

D. bad

5. What kind of person would not use a PDA? [ ]

A. Someone who hates computers.

B. A student.

C. A person with a busy time table.

D. A business (商) person.

下列哪项不是经期延长之阴虚血热证的主症（）

A.月经持续8～9日，量少、色红、质稠

B.小腹疼痛拒按

C.咽干口燥

D.手足心热

E.舌红少苔，脉细数

根据消费者送礼和自用两种目的，杏林酒厂将同样的酒采用精致和简约两种包装，并制定不同的价格。这种包装策略是（ ）

A．相关包装策略

B．分等级包装策略

C．差异包装策略

D．相似包装策略

对待事故三不入过的原则是，即（）不放过，（）不放过，没有防范措施不放过。