收集打印文书样本时应注意的问题有哪些？

（）意思为选择对象等高。

肺毛细血管楔压

阅读理解。

     Teenagers in England do much the same as children in America do. They enjoy sending messages by

their mobile phones and they also like swimming, listening to the latest music, watching TV and surfing the

Internet.

      How do teenagers in England spend their free time and holidays? Let's follow Sally, a British teenager, and spend five days with her during her school holiday.

      Day One

     After breakfast, Sally's mother went out and left her alone at home. She checked her mobile phone

during lunch -one of her friends sent her a message early in the morning. Dinner was at 6:30 p.m. After

that, she finished her English homework. Then she surfed the Internet.

     Day Two

     Sally and her mother paid a visit to their friends and went swimming together. Later, they went shopping for clothes and books, and had dinner in a restaurant.

     Day Three

     She went to the supermarket with her mother to buy fish and chips for lunch as well as some pens.

After she got back home, she spent the next few hours surfing the Internet and watching TV.

     Day Four

     She surfed the Internet. Her mother took her out for lunch before she went to work. She then read

stories after lunch.

     Day Five

    She woke up at 2 p.m., and so did her mother. They went to a park. Her mother met some friends

there. When they got home, it was already time for dinner. Afterwards, she did her homework until 10

p.m.

1. Sally and her mother went shopping again to buy _____.

A. food for lunch and pens

B. some books and pens

C. some fish and clothes

D. food and books

2. Which of the following things did Sally do on Day Four?

A. She went swimming.

B. She went out for breakfast.

C. She read books. 

D. She went shopping.

3. According to the passage, it can be inferred that _____.

A. a park is the best place to meet a friend

B. parents shouldn't leave teenagers alone at home

C. teenagers don't usually do their homework during their school holidays

D. surfing the Internet has become an important part of teenagers' lives

目前大容量高温高压锅炉给水泵设计工况点（最佳工况点）的总效率η值可达（）。

A、50%~60%

B、60%~70%

C、80%~85%

D、90%~96%