鞭虫主要寄生部位是小肠。()

在一场挑战赛中，由于下雨，比赛被迫暂停25分钟，当比赛重新开始时，运动员可以有多长的准备活动时间？（）

A、没有准备活动

B、2分钟准备活动

C、3分钟准备活动

D、5分钟准备活动

质量为2kg的金属块，温度从20℃升高到70℃，吸收的热量为7×10⁴J，这种金属的比热容为多少？

阅读理解。

     He has vowed that he will not stop building his business until it is worth ￡100 million. But hard-working

Owens can stop for at least a moment's celebration after making his first ￡1 million at the age of 16. Owens,

who has used a computer since the age of seven, began teaching himself basic web design at the age of ten

when he was given his first Mac computer. He used his pocket money to fund his first business project,

website Mac Box Bundle at just 14 which has made ￡700,000 since its establishment in 2008. Mac Box

Bundle sells a combination of popular Mac applications which are worth up to $400 together for under just

$100 and donates 10 percent of the money to charities.

    He then established an advertising company Branchr a year later and worked on the business after school

and at weekends. Branchr made a surprising ￡500,000 in its first year. Branchr works as a platform for

website owners to sell advertising.

     Owens, from Northampton, currently employs eight staff-all adults-around the UK and America as sales

and technical assistants. The young man lives with his parents. His mother who is a company secretary said

he was inspired to go into business after observing the huge success achieved by Apple's chief executive

officers (首席执行官) Steve Jobs.

     Owens said,"I think everyone has business sense in them, and they just need to gain experience and be

determined to make it. There is no magical formula (法则) for business, It takes hard work, determination

and the drive to do something great. My aim is to become a leading name in the world of Internet and mobile

advertising and push myself right to the top of the game.

     The teenager insists his professional success has not affected his personal life, and says his interests

include photography and playing the guitar. "My friends and I don't really talk about my success. To them

I'm just a normal teenager and it doesn't change anything between us."

1. What can we know from Paragraph 1?

A. Owens' company is worth ￡1 million now.

B. Owens learned to use computers at the age of 10.

C. Owens made ￡700,000 from Mac Box Bundle in 2008.

D. Owens is successful and enthusiastic about public welfare.

2. From Paragraph 2 we know that Branchr _______.

A. takes up all Owens' spare time

B. offers a platform for advertising business

C. designs practical software for website owners

D. takes up advertising business for Nac Box Bundle

3. Why did Owens come up with the idea of doing business?

A. Because eight adults were ready to help.

B. Because it was easy to establish web companies.

C. Because his parents wanted him to have a try.

D. Because he drew inspiration from Steve jobs.

4. Owens tends to think that ________.

A. every person has potential talent for business

B. getting experienced in business needs determination

C. it is hard work for people to decide to do something great.

D. he is sure to play a leading part in the world of the Internet.

5. What do Ownes' friends think about him?

A. He sets a good example.

B. He does quite well in music.

C. He is a common school boy.

D. He puts friendship above anything else.

标准状况下CO₂和CO的混合气体17.2 g，总体积为11.2 L，试求CO₂的物质的量_________mol , CO的物质的量___________ mol

在通常情况下，追索权行使的实质要件，表现为持票人的提示请求受到拒绝，包括______受到拒绝和______受到拒绝。