问题 选择题

动物细胞中的能量转换器是(  )

①液泡 

②染色体  

③线粒体  

④叶绿体.

A.①②

B.③

C.③④

D.②④

答案

线粒体是广泛存在于动物细胞和植物细胞中的细胞器,是细胞进行呼吸产生能量的主要场所.叶绿体是绿色植物细胞中广泛存在的一种能量转换器,是植物细胞进行光合作用的场所.因此,叶绿体和线粒体是细胞中的能量转换器.动物细胞中只有线粒体,植物细胞中有线粒体和叶绿体.

故选:B

阅读理解

Jeff Keith has only one leg. When he was 12 years old, Jeff had cancer(癌症). Doctors had to cut off most of his right leg.

Every day Jeff puts on an artificial leg(假腿). With the plastic artificial leg Jeff can ride a bicycle, swim, and play soccer. He can also run.

Jeff made a plan with his friends who had plastic legs, too. They decided to run across America.

When he was 22 years old, Jeff Keith ran across the United States from the east to the west. He started running in Boston. Seven months later, he stopped running in Los Angeles. He ran 3,200 miles. Jeff stopped in cities on the way to Los Angeles. In every city people gave Jeff money. The money was not for Jeff, but for the American Cancer Society.

Jeff is disabled, but he can do many things. He is studying to be a lawyer(律师). Jeff says, “People can do anything they want to do. I want people to know that. I ran not only for disabled people. I ran for everybody.”

根据短文内容,选择最佳答案。

小题1:Jeff’s right leg was cut off because he had_______.

A.TB(肺结核)

B.an accident

C.cancer

D.a serious injury小题2: From the passage we know that Boston is _______.

A.in the west

B.half between the east and west

C.near Los Angeles

D.in the east小题3:It took Jeff _______ to run from Boston to Los Angeles.

A.about four and a half months

B.over two hundred days

C.almost twenty-five weeks

D.less than half a year小题4:The underlined word “disabled” means _______.

A.优秀的

B.劳累的

C.残疾的

D.无能为力的小题5:The fifth passage tells us that _______.

A.people should give him more money

B.people can do anything they want to do

C.some disabled men will become lawyers

D.disabled people also can run

填空题