离子型对比剂的特点是A．低渗性、弱离子性、高亲水性B．高浓度、低毒性、高亲水性C．低

阅读理解。

     The tradition of birthday parties started a long time ago. There are some traditions that you can find

almost anywhere, anytime, such as sending birthday cards, blowing out the candles on a birthday cake

and singing the Happy Birthday song. Others are only found for certain ages and in certain countries.

In China, on a child's second birthday, family members put many things on the floor around the child.

According to Chinese tradition, the first thing that the child picks up tells you what profession the child

will choose later in life. For Japanese children, the third, fifth and seventh birthdays are especially important.

At this age, there is a special celebration Shichi-Go-San (seven, five, three in Japanese) when children go to

the temple wearing a new kimono (和服). The priest (僧侣) gives them special sweets, and the parents

usually organize a party for their friends in their home. In Argentina, Mexico and several other Latin American

countries, girls have a special birthday celebration when they reach the age of fifteen. After a special ceremony (仪式), the girls dance a waltz with their father and other boys. Eighteen is the traditional "coming of age",

the age when (in many countries) you have the right to vote (选举), join the army and (in Britain) drink

alcohol or buy a house. In many English-speaking countries, a twenty-first birthday cake often has a key on

top, or the cake itself is sometimes in the shape of a key. The key mean8 that the young person is now old

enough to leave and enter the family home at any time they want to!

1. Which of the following birthday traditions can be found almost anywhere, anytime?

A. Putting many things on the floor.

B. Wearing a new kimono.

C. Dancing a waltz.

D. Sending birthday cards.

2. The ______ usually organize a party at children's special birthday celebration in Japan.

A. priests

B. parents

C. friends

D. relatives

3. Mexican girls have a special birthday celebration at the age of ______.

A. five

B. seven

C. fifteen

D. twenty-one

4. In many countries you can ______ when you reach the age of eighteen.

A. join the army

B. have a key

C. have a special ceremony

D. have special sweets

5. Which of the following sentences is NOT true?

A. The tradition of birthday parties started a long time ago.

B. Some birthday traditions are only found in certain countries.

C. You become the owner of your house at the age of fifteen.

D. In many countries you have the right to vote at the age of eighteen.

△ABC中，∠A的正弦记作 [ ]

A．sinA

B．cosA

C．tanA

D．cotA

James Martin在论述战略数据规划方法时明确指出，系统规划的基础性内容包括______。这几方面的基础件建设得到保证时，就可以在其基础上开发各种应用项目。

A．企业计算机管理信息系统的设备配置规划、企业特定的主题数据库的规划

B．企业的经营战略规划、企业特定的主题数据库的规划

C．企业的经营战略规划、企业计算机管理信息系统的设备配置规划、企业特定的主题数据库规划

D．企业的经营战略规划、企业计算机管理信息系统的设备配置规划

美国学者安德森排列出了喜爱程度最高的六个人格品质，排第一位的人格品质是（）。

A.诚实

B.真诚

C.理解

D.忠实

E.真实

扣件式钢管脚手架作业层上非主节点处的横向水平杆，宜根据支承脚手板的需要等间距设置，最大间距可大于纵距的1/2。（）