生态系统能量的流动就是通过（）进行的。A、消费者 B、食物链和食物网 C、生产者 D

Having friends, and finding new friendships is an important developmental task for preteens and teens. While they have learned to play well with others during their childhood, developing independent friendships is a different thing. Preteens and teens will be allowed to use their own resources to decide whether to be someone’s friend or not, instead of being taught by their parents. Parents must give their teenagers some freedom in choosing who they want to hang out with.

You can help your teens to choose their friends, although it’s your teenagers who make the final decision. You can use teachable moments to talk about what makes a good friend. Here are some points to remember when you talk about friendships with your teenagers:

1) You are allowed to have many friends;

2) Honesty is important in a friendship;

3) Friends sometimes hurt each other, but they can say sorry and forgive(原谅);

4) Friends can influence each other, sometimes they will help you but sometimes they will hurt you, too.

5) Who you choose to be your friend is important, so choose wisely;

6) It takes many learned skills to make and keep a friendship, and it also takes many skills to end a friendship;

7) It is okay and even helpful to make friends with the opposite gender(异性);

8) It takes time to make a good friend, but it is worth the effort;

9) Spending time together will help you get to know your friends well and you will feel comfortable sharing feelings;

10) A good friendship will make you feel good about yourself.

小题1:What should their parents do when teenagers make friends?

A．Do nothing but give them all the freedom.

B．Talk with them and give some help.

C．Decide and choose friends for them.

D．Stop them from making friends with opposite gender.小题2:Which point is about how to end a friendship?

A．Point 3.

B．Point 4.

C．Point 5.

D．Point 6.小题3:Which of the following is NOT needed in making friends?

A．Honesty.

B．Effort.

C．Lies.

D．Skills.小题4:Who is the passage mainly written for?

A．Teachers.

B．Parents.

C．Preteens.

D．Teens.小题5:Which of the following statement is true?

A．Friends never hurt each other.

B．There is no need to forgive friends.

C．Teenagers are allowed to have many friends.

D．Girls should never make friends with boys.

无论是调频信号还是调相信号，它们的ω（t）和φ（t）都同时受到调变，其区别仅在于按调制信号规律线性变化的物理量不同，这个物理量在调频信号中是（）.

A.ω（t）

B.φ（t）

C.Δω（t）

D.Δφ（t）

某大医院一位眼科博士，因急于为两位病人进行角膜移植，而又一时找不到现成的供体角膜，所以在太平间"盗取"了一病死者的尸体角膜用于移植，获得成功。此事后被死者家属发现，以未经本人生前及死者家属知情同意，严重损害了死者及其家属的权益为由，将该医生告上了法庭。经调查得知：接受眼角膜移植手术的两位病人与该医师无特殊关系；死者生前与该医师无利害冲突；该医师也未由此谋取分文私利，只是不了解有关要求。

对该医师的正确医德评价应为（）。

A.符合医德要求

B.不符合医德要求

C.说不清

D.不能进行医德评判

E.以上都不对

在R9协议中，同一个用户在上行不能同时使用PUCCH和PUSCH信道。（）

高压离心风机在立窑应用、安装中注意事项有哪些？