国债的功能有( )。A．集中社会暂时闲置储蓄资源，提高整个社会资源运行效率 B．转

To many students, joining social media (社交媒体) “circles” is now more important than making new friends in real life.

And it’s easy. If you have a cell phone, you can download apps (应用程序) such as Sina Weibo, WeChat (微信) and QQ.

“I love to check my friends’ updates (更新). I also enjoy news and humor shared on social media,” Said Ou Wei, 14, from Hongling Middle School in Shenzhen. Because of enjoying these, Ou distances himself from real life. “I love playing the plane-shooting game on WeChat, but have no interest in playing flying chess with my classmates,” said Ou.

Deng Yunyun, 14, from Jianfeng Middle School in Shanghai, said that social media had influenced their life. Recently his school held a basketball match, and a student hurt his leg. Instead of giving him some help, students were busy with updating micro blogs about the accident.

“I think they need to learn to balance their real and online lives,” said Deng,

What makes parents and teachers worried is safety. “Many students are happy to tell their interests and personal information to their social media “friends”. Such information could bring them danger,” said Han Songjun, a teacher at Hongling Middle School.

For example, WeChat’s shake-shake function allows users to connect to other users close by. But the police warn about the danger of socializing in this way.

“Be careful. Do not use the locating (定位) function in any app, do not give your name, and do not post the photos of your residential area (小区),” said the police.

小题1: What is the possible meaning of the underlined word “distances” in Paragraph 3?

A．接近

B．疏远

C．超过

D．破裂小题2:The example (the basketball match) in Paragraph 4 is given to show _______.

A．Deng Yunyun’s school held a basketball match

B．the students in the school are not friendly

C．students are very busy

D．social media have influenced the students’ life小题3: The police give many suggestions except “_______”.

A．Do not share any news on social media

B．Do not use the locating (定位) function on social media

C．Do not give your name on social media

D．Do not post the photos of your residential area小题4: What does the writer want to tell us?

A．Many students are using WeChat.

B．Social media makes our life more interesting.

C．Social media is very popular.

D．Social media can be bad and dangerous.

图中A是高粱和薯类等经过发酵、蒸馏得到一种可再生能源，G是常见白色难溶盐．

（1）反应①的化学方程式是______；

（2）反应②的基本反应类型是______；

（3）反应③的化学方程式是______．

关于黏液表皮样瘤的描述，错误的是()

A．又称黏液表皮样癌

B．为涎腺少见疾病

C．病程长者生长慢，无痛，质硬，体积小

D．病程短者生长快，疼痛，可溃破

E．瘤体无包膜，周围界限欠清晰，可侵犯邻近组织

下列组织和器官参与咳嗽动作，除了

A．咽肌
B．声门
C．膈肌
D．腹肌
E．腰大肌