铁路货车提速转向架有（）。 A.转8A B.转8B C.转8AB D.转K6

20×8年1月1日，甲公司自证券市场购入面值总额为2000万元的债券。购入时实际支付价款2078.98万元，另外支付交易费用10万元。该债券发行日为20×8年1月1日，系分期付息、到期还本债券，期限为5年，票面年利率为5%，年实际利率为4%，每年12月31日支付当年利息。甲公司将该债券作为持有至到期投资核算。假定不考虑其他因素，该持有至到期投资20×8年12月31日的账面价值为( )万元。

A．2062.14
B．2068.98
C．2072.54
D．2083.43

普鲁烟酰胺作用机制是

A．抑制钠内流
B．抑制钙内流
C．促进钾内流
D．阻断β-受体
E．延长动作电位时间

VI.阅读表达(共5小题;每小题2分，满分10分)

阅读下面短文，并根据短文后的要求答题.

阅读下面的短文，请根据短文后的要求答题（请注意问题后的字数要求）

There’s a lot of discussion these days about fit kids. Being fit is a way of saying a person eats well, gets a lot of physical activity (exercise), and has a healthy weight. If you’re fit, your body works well, feels good, and can do all the things you want to do.

Here are four rules to live by, if you’re a kid who wants to be fit.

1. Eat a variety of foods, especially fruits and vegetables.

You may have a favorite food, but the best choice is to eat a variety. If you eat different foods, you’re more likely to get the nutrients your body needs. Taste new foods and old ones you haven’t tried for a while.

2. Drink water and milk most often.

When you’re really thirsty, cold water is the No. 1 thirst-quencher. And there’s a reason your school cafeteria offers cartons of milk. Kids need calcium to grow strong bones, and milk is a great source of this mineral.

3. Listen to your body.

What does it feel like to be full? When you’re eating, notice how your body feels and when your stomach feels comfortably full. Sometimes, people eat too much because they don’t notice when they need to stop eating. Eating too much can make you feel uncomfortable, and over a period of time, it can lead to ___________________.

4. Be active.

One job you have as a kid-and it’s a fun one-is that you get to figure out which activities you like best. Not everyone loves baseball or soccer. Maybe your passion is karate, or kickball, or dancing. Ask your parents to help you do your favorite activities regularly. Find ways to be active every day.

81．What is the best title of this passage? (Please answer within 10 words)

_______________________________________________________________________

82．Which sentence in the passage can be replaced by the following one?

You might keep yourself healthy and vivid as a result of a variety of foods.

_______________________________________________________________________

83．Please fill in the blank in the 4th paragraph with proper words or phrases to complete the sentence. (Please answer within 10 words)

_______________________________________________________________________

84．Which of the four rules do you think is the most important for you? Why?

(Please answer within 30 words)

_______________________________________________________________________

85．Translate the underlined sentence in the last paragraph into Chinese.

_______________________________________________________________________

著作权人享有的人身权有（）。

A.修改权

B.发表权

C.保护作品完整权

D.署名权

A市政公司中标了地铁车站和区间隧道工程标段，将双线盾构施工分包给了具有专业资质的B公司，以满足建设方的工期要求。分包合同约定：工作井土建施工由A公司项目部负责，盾构吊运、安装均由B公司负责，A公司项目部配合。在吊装盾构机主体时，出现地面沉陷致使汽车吊向井壁外侧倾翻；侥幸的是无人伤亡。但是盾构机外壳有些撞伤，经鉴定可以修复并不影响施工；吊车侧部严重变形损坏，需进行大修。事故调查报告表明，现场硬化地面未进行承载力检验。

试分析本次事故的主要原因。