问题 选择题

蝙蝠能够飞行,但不属于鸟类,而是属于哺乳类.主要由于是(  )

A.蝙蝠能用超声波定位

B.蝙蝠能滑翔

C.蝙蝠四肢有爪

D.蝙蝠有胎生、哺乳的特征

答案

蝠能够飞行,但不属于鸟类,而是属于哺乳类.主要理由是:因为它不具有鸟类的一般特征.鸟类的翼是前肢变成的,而它的翼是由前后肢和尾部之间的皮膜连成的.而且蝙蝠的体表无羽而有毛,口内有牙齿,体内有膈将体腔分成胸腔和腹腔,这些都是哺乳动物的基本特征,更重要的是,蝙蝠的生殖发育特点是胎生、哺乳,而不像鸟类那样卵生,这一特征证明蝙蝠是名副其实的哺乳动物.

故选:D

阅读理解

An old problem is getting new attention in the United States—bullying. Recent cases included the tragic case of a 15-year-old girl whose family moved from Ireland. She hanged herself in Massachusetts following months of bullying. Her parents criticized her school for failing to protect her. Officials have brought criminal charges against several teenagers.

Judy Kuczynski is president of an anti-bullying group called Bully Police USA. Her daughter Tina was also the victim of severe bullying starting in middle school in the state of Minnesota. She said,“Our daughter was a very outgoing child. She was involved in all kinds of things and had lots of friends. And over a period of time her grades fell completely. She started having health issues. She couldn't sleep. She wasn't eating. She had terrible stomach pains and didn't want to go to school.”

Bullying is defined as negative behavior repeated over time against the same person. It can involve physical violence, or it can be verbal—for example, insults or threats. Spreading lies about someone or excluding a person from a group is known as social or relational bullying.

And now there is cyber-bullying, which uses the Internet, e-mail or text messages. It has easy appeal for the bully because it does not involve face-to-face contact and it can be done at any time.

The first serious research studies into bullying were done in Norway in the late 1970s. The latest government study in the United States was released last year. It found that about one-third of students age twelve to eighteen were bullied at school.

Susan Swearer is a psychologist at the University of Nebraska-Lincoln and co-director of the Bullying Research Network. She says schools should treat bullying as a mental health problem to get bullies and victims the help they need. She says bullying is connected to depression, anxiety and anti-social behavior and bullies are often victims themselves.

小题1: From the case of Tina, we can know that ________.

A.bullying is rare

B.victims suffer a lot

C.schools are to blame

D.personalities are related小题2:Which of the following is NOT bullying?

A.To beat someone repeatedly.

B.To threaten someone verbally.

C.To isolate someone from friends.

D.To refuse to help someone in need.小题3:Why is cyber-bullying appealing to the bully?

A.Because it can involve more people.

B.Because it can create worse effects.

C.Because it is more convenient.

D.Because it can avoid cheating.小题4:According to Susan Swearer, ________.

A.bullies are antisocial

B.bullies should give victims help

C.students are not equally treated

D.bullies themselves also need help

单项选择题