A、 B、 C、 D、E类安全净距的具体含义是什么？以A1为基础，他们分别是如何计算的？

填入下面这段文字中括号内的词，正确的一组是（）。《琵琶行》中“同是天涯（）人，相逢何必曾相识”句，是诗中关键句，也是名句。它承上启下，从琵琶女的飘零身世（）到诗人的宦途潦倒，（）了诗人和艺人的感情渠道。前后两段都是在记叙中抒情，这两句却是在抒情中说理，这样增强了抒情的深度，提高了诗的思想境界。

A．沦落过渡沟通

B．沦落过度勾通

C．冷落过度沟通

D． 沦落过渡勾通

化疗病人考虑停药的白细胞计数是

A．4.0乘以十的九次方/L

B．1.0乘以十的九次方/L

C．5.0乘以十的九次方/L

D．2.0乘以十的九次方/L

E．3.0乘以十的九次方/L

阅读理解。

     Finding summer jobs for teenagers has not always been easy, but now you no longer have to worry

about what your kid can do to earn their own money. Recently I found some different sites online that offer

information about what kids can do. Below is some of that information, along with questions to think about

to help you come up with your own ideas. Ideas for summer work:

● Parks and Recreation Programs.

● Babysitting (当临时保姆) during the day of school.

● Working part-time at a day care for the summer.

● Car washing.

● Working at local vegetable stands.

     The easiest way for you to find ways for your child to make money is to think about others' inconveniences

(不方便). Think of things you need done, or would like to have done, and what you would consider paying

for these things to get done. Once you have some ideas, you can sit down with your child and talk to them

about what they would be interested in doing. Then once you have an idea of what they want to do you can

help them come up with fair prices.

     Preferably you would want to only have your child working with people you know and trust, or in the least

bit you could have your child pick a partner. That way with each of them carrying cell phones, even those

without service can call 911, they will be much safer.

     You can find out more information and many more ideas for kids to use to make money during their summer

holidays by visiting http://www.kidswantmoney.com

1. The author wrote the passage to _____. [ ]

A. share his discoveries online

B. introduce jobs for teenagers

C. advertise a website for teenagers

D. talk about his summer work experience

2. Which of the following is NOT considered when teenagers look for summer jobs? [ ]

A. Who they'd better work for.

B. How much should be charged.

C. Whether the jobs are safe. D. Where the workplace is.

3. What can we learn about http://www.kidswant-money.com? [ ]

A. The author set up the website.

B. It gives information about educating children.

C. People need to pay to visit the website.

D. It offers ideas for children to make money.

人体肺循环和体循环的起始部分分别是（　　）

A．左心房、右心房

B．左心室、右心室

C．右心房、左心房

D．右心室、左心室

手枪低姿戒备适合在危险情况下运用。