检查蛲虫卵的粪便要求（） A.用透明拭子清晨于病人肛门周围取粪便 B.夜间用透明

Do you ever find yourself getting really unhappy for almost no reason? Or suddenly feeling down without knowing why? Going from sadness to anger to joy in a matter of minutes can make many teens feel as though they're losing control. But why is the feeling so common among teens?

Maybe you're starting a new school and not able to see old friends as much. Getting good grades or wanting to be better in sports or other activities can be a concern (关注)for many teens.

Being accepted by friends is important. Teens also may notice, for the first time, a sense of distance from parents and family. You may feel you want to be on your own and make your own decisions, but it can also seem a bit lonely at times.

Another important cause for mood swings is biology. When puberty（青春期）begins, the body starts producing hormones（荷尔蒙）. These hormones cause physical changes in the body. But in some people, they also seem to cause emotional(情绪的)changes.

Here are some things you can do that might make those bad moods a bit easier to deal with.

Recognize you're not alone. Although not every teen experiences mood changes to the same degree, they are common.

Talk to people you trust. Friends can help each other by realizing that they're not alone in their feelings. Talking to parents is important, too. Parents can share their own experiences dealing with bad moods. Teachers are often good resources and a doctor can help to answer questions about development.

Get enough sleep. Though it can be hard to find enough time, getting enough rest is very important. Being tired can lead to more sadness.

Create. Taking part in some kinds of activities, like building something out of wood, or starting an art or music piece. Writing can help you organize and express your thoughts and feelings. Get your thoughts on paper. Do the same thing with paint, music, or other art forms. Put your feelings into your artwork.

小题1:When puberty begins, many teens feel__________.

A．unhappy

B．angry

C．joyful

D．emotional小题2:_______may not make some teens be in bad moods.

A．Study pressure

B．Getting good grades

C．The sense of distance from parents

D．Missing old friends小题3: It’s easier to deal with your mood changes by ___________.

①realizing they are common     ②explaining your feelings to people you trust

③playing computer games        ④being creative

⑤breaking school rules         ⑥getting enough sleep

A．①②③④

B．①②③⑥

C．①②④⑥

D．①③④⑤

给水工程通常包含哪两部分？

第六次人口普查统计中，广东省常住人口数居全国首位，而实际户籍人口数排第三位。出现此现象，主要是因为广东省：

A．经济发达，劳动力需求量大

B．地域辽阔，资源丰富

C．环境优美，适宜居住疗养

D．沿海，对外交通便利

某操场上有学生100人，其中男生占，后来又来了若干名男生，使得男生占女生人数的，则后来又来了（）名男生。

慢性阻塞性肺气肿首先发生的病理生理改变是（）。

A.缺氧

B.CO₂潴留

C.同时出现缺氧和CO₂潴留

D.呼吸性酸中毒

E.呼酸+代酸