问题 选择题

下列不属于鸟类适应空中飞行生活的形态结构特征的是(  )

A.身体呈流线型

B.体表被覆羽毛

C.前肢变成翼

D.胚胎发育在卵蛋内完成

答案

多数鸟类营飞行生活,其结构特征总是与其生活相适应的.如体表被羽毛,前肢变成翼,适于飞行;身体呈流线型,可以减少飞行时的阻力;体内有气囊,辅助肺完成双重呼吸,可以供给充足的氧气;有的骨中空,有的骨愈合,直肠很短,能减轻体重;胸肌发达,利于牵动两翼完成飞行动作,胚胎发育在卵蛋内完成与飞行生活没有直接关系.

故选:D

阅读理解

阅读理解。

     After filling the car with gas, I continued driving to the airport. The roads were quite bumpy (颠簸) and I

noticed that the highway department was doing some reconstruction, although some parts of the road hadn't

been completed yet. I drove on a completed part of the highway that was flat and smooth for one and a half

hours. Afterwards, the road became a little rough and bumpy again, and there weren't even any street lights

on the side of the road. We started driving in the early hours of the morning and I think because it was really

early and drivers on the road were tired so they couldn't concentrate (集中注意力). I saw three separate car

accidents during the journey. 

     When starting driving in an area that I didn't know well, I let the other car lead the way and I followed

behind them. As we were driving inside a tunnel, I suddenly saw a truck hit the side of the wall, rebound (反

弹), then turned back onto the middle of the road. The truck nearly hit the car in front of us. I think the driver

of the truck must have fallen asleep at the wheel otherwise this wouldn't have happened. He nearly caused a

car accident.

     I was driving behind the cars and I saw everything happen in front of me. The incident gave me such a

fright that it immediately woke me up. In my mind I kept telling myself that I was driving a car and that I had

to stay alert (清醒). To my relief, all the members in the other car were okay because if that truck really did

hit the car traveling in front of us, I don't think I'd be able to make it back to Hong Kong. Not only that, all the

passengers in the other car would have to go to hospital.

1. From the first paragraph we know the road _____.[ ]

A. was bumpy all the way to the airport

B. was blocked by three car accidents

C. was bright because of the street lights

D. was being repaired

2. There were car accidents during the writer's journey mainly because _____. [ ]

A. the traffic was heavy in the morning

B. there were no street lights

C. sleepy drivers couldn't fix their attention

D. the road was very bumpy

3. What can we know from the passage? [ ]

A. An accident happened inside the tunnel.

B. The truck driver may have fallen asleep when driving.

C. The writer's car was almost hit by the truck.

D. All the passengers in the other car were sent to the hospital.

4. When the incident happened, the writer was _____. [ ]

A. sleepy

B. asleep

C. wide awake

D. attentive

单项选择题