国内保理业务按照是否通知买方应收账款转让事宜，分为（）。A、明保理 B、暗保理 C、通知

某电信公司开设了两种通讯业务，第一种：使用者先交21元月租费，然后每通话1分钟，再付话费0.2元；第二种：不交月租费，每通话1分钟，付话费0.4元．若一个月内通话x（分钟），两种方式的费用分别为y₁（元）和y₂（元）．

（1）分别写出y₁，y₂与x之间的函数表达式；

（2）一个月内通话多少分钟时，两种通讯业务的费用相同？

（3）某人估计一个月内通话300分钟，选择哪种通讯业务较合算？

阅读理解。

     How can you help kids cope with (应对) stress? Proper rest and good nutrition can improve coping

skills, so can good parenting. Make time for your kids each day. Whether they need to talk or just be in

the same room with you, make yourself available.

     Even as kids get older, quality time is important. It's really hard for some people to come home after

work, get down on the floor, and play with their kids or just talk to them about their day-especially if

they've had a stressful day themselves. But expressing interest in your kids shows that they're important

to you.

     Help your child cope with stress by talking about what may be causing it. Together, you can come up

with a few solutions. For example, he should cut back on after-school activities, spending more time

talking with parents or teachers, developing an exercise plan or keeping a journal.

     You can also help by predicting potentially stressful situations and preparing kids for them. For

example, let a child know ahead of time(but not too far ahead of time) that a doctor's appointment is

coming up and talk about what will happen there. Keep in mind, though, that younger kids probably

won't need too much advance preparation. Too much information can cause more stress.

     Remember that some level of stress is normal; let kids know that it's OK to feel angry, scared, lonely,

or anxious and that other people share those feelings.

     When kids can't or won't discuss these issues, try talking about your own concerns. This shows that

you're willing to handle tough topics and are available to talk with when they're ready. If a child shows

symptoms (症状) that concern you and is unwilling to talk, consult a counselor or other mental health

experts.

     Most parents have the skills to deal with their children's stress. The time to seek professional attention

is when any change in behavior continues to exist, when stress is causing serious anxiety, or when the

behavior is causing significant problems in functioning at school or at home.

1. What is the purpose of the text?

A. To share the author's ideas on proper parenting.

B. To persuade parents to spend more time with kids.

C. To advise parents how to help kids deal with stress.

D. To seek different ways to help solve kids' problems.

2.What makes it difficult for parents to spare quality time for kids?

A. Kids growing so fast.            

B. Parents being tired out.

C. Kids losing interest in parents.      

D. There being too much homework.

3. You are advised not to talk too much about a stressful situation in advance because        . 

A. it does no good to your kids

B. it doesn't work in practice

C. your kids may lose interest

D. your kids don't want to listen

4. What can we learn from Paragraph 5?

A. Normal people share the same feelings.

B. It is normal for kids to have some stress.

C. Kids should get rid of the negative feelings.

D. Everybody feels angry, scared, lonely or anxious.

锅炉的总的有效利用热量占送入锅炉总热量的百分比叫（）。

链传动的缺点有传动不平稳、使用寿命短、（）等。

A、无过载保护

B、结构简单

C、两轴中心距较大

D、效率低

细水雾灭火系统可以扑救（）

A.塑料泡沫火灾

B.汽油火灾

C.变压器火灾

D.碳化钙火灾

E.可燃固体的深位火灾