问题 选择题

如图是哺乳动物的心脏模式图,含氧较多的血是由(  )进入心脏的.

A.⑤

B.⑥

C.⑦

D.⑧

答案

在图示中,①为右心房,②为左心房,③为右心室,④为左心室,⑤体静脉,⑥为肺动脉,⑦为主动脉,⑧为肺静脉.在血液循环中,血液是由静脉进入心房的.所以B和C项排除.当血液流经肺部毛细血管时,肺泡中的氧气通过气体扩散进入血液,血液由含氧少颜色暗红的静脉血变成含氧多的颜色鲜红的静脉血,随着肺静脉回到心脏,所以D项正确.

故选:D

阅读理解

阅读理解。

     Question:What is more astonishing than a 60-ton whale on a

flatbed truck being driven down the street?

     Answer:A 60-ton whale on a flatbed truck exploding and rai-

ning blubber( fat of whales) all over the sidewalk.

    That's what happened in Taiwan recently,when a dead sperm

whale being shipped to the Halobios Research Centre for an autopsy

(尸体解剖) developed an extremely bad case of gas and blew up

before it reached its destination.

     The whale was found alive on a Taiwan beach last weekend,

and died shortly after it was discovered. Since the 56-foot whale was

the largest whale ever beached on Taiwan's shores,scientists wanted

to study it and perform an autopsy for educational purpose.

      Obviously,too much time passed between when the animal died

and the time it was set to be moved to the autopsy location,because

it had already started to go bad. When things rot,they give off gases

as a by-product. In the whale's case,the gases were trapped in its

belly. The pressure inside the rotting creature grew so much that it

popped like an over-filled balloon. Unfortunately,it was on a truck in

the middle of the city of Taiwan at the time ;cars and shops lining the

street were covered with whale bits and juices,much to their owners'

discouragement.

      According to news reports,traffic was tied up for hours while of

ficials tried to clean up the streets.

     Newspaper editors worldwide were probably smiling to them-

selves,since they had a ready-made headline; several reports about

the incident were titled " There  She  Blows ! " after the famous line

from the book Moby Dick.

1. The purpose of the question at the beginning of this news report  is to ___.

A. explain the reason

B. sell newspapers

C. attract readers

D. give an immediate answer

2. The whale's explosion was the result of___.     

A. pressure from gases building up in the creature as it began to rot

B. the long transport of the creature from the beach to the centre

C. the extremely busy traffic in the streets it passed by

D. the quick process of rotting of the animal

3. What is the correct order of the incidents?

        a. The whale was set to a flatbed truck.

        b. The whale was discovered.

        c. The whale exploded.

        d. The whale died.   

A. b;c;a;d                        

B. d;c;b;a

C. b;d;a;c                        

D. d;b;a;c

4. What do we know from the last paragraph?

A. Some newspaper editors were laughed at.

B. Moby Dick is the name of a woman writer.

C. All the newspapers reported the story under the same title.

D. The title" There She Blows ! " is taken from the book MobyDick.

单项选择题