问题 选择题

如图在两滴连通的草履虫培养液左侧加盐,一段时间后发现草履虫集中分布在右侧,说明(  )

A.生物体能由小长大

B.生物体在生长过程中,必须从外界获得物质和能量

C.生物体对外界刺激能作出一定的反应

D.生物体都能适应一定的环境,也能影响环境

答案

生物具有一下特征:1、生物的生活需要营养.2、生物能够进行呼吸.3、生物能排出体内产生的废物.4、生物能够对外界刺激作出反应.5、生物能够生长和繁殖.6、生物具有遗传变异的特性.7、除病毒外,生物都是由细胞构成的.其中新陈代谢(包括生物的生活需要营养、能够进行呼吸、能排出体内产生的废物等)是生物最基本的特征,在此基础上生物才有生长、繁殖和应激性等生命特征.

食盐对草履虫是有害的刺激,草履虫要躲避它,培养液对草履虫是有利的刺激,草履虫要趋向它.一段时间后发现草履虫集中分布在右侧(培养液),说明草履虫能够逃避有害刺激,趋向有利刺激;这体现了生物体对外界刺激能作出一定的反应.

故选C.

选择题
阅读理解

Our house was directly across the street from the clinic entrance of John Hopkins Hospital in Baltimore. We lived downstairs and rented the upstairs rooms to the patients at the clinic.

One evening as I was fixing supper, there was a knock at the door. I opened it to see a truly awful looking man. He’s hardly taller than my eight-year-old son. “Good evening. I’ve come to see if you’ve a room. I came for a treatment this morning from the eastern shore, and there’s no bus till morning.” He told me he’d been hunting for a room since noon but with no success. “I guess it’s my face... I know it looks terrible, but my doctor says with a few more treatments...” For a moment I hesitated, but his next words convinced me: “I could sleep in this chair on the porch. My bus leaves early in the morning.”

I told him we would find him a bed. When I had finished the dishes, I talked with him. He told me he fished for a living to support his five children, and his wife, who was hopelessly crippled(残疾的)from a back injury. He didn’t tell it by way of complaint. Next morning, just before he left, as if asking a great favor, he said, “Could I come back and stay the next time?” He added, “Your children made me feel at home. ”

On his next trip he arrived a little after seven in the morning. As a gift, he brought a big fish and the largest oysters(牡蛎)I had ever seen. I knew his bus left at 4:00 a. m. and I wondered what time he had to get up in order to do this for us.

In the years he came to stay overnight with us and there was never a time that he did not bring us vegetables from his garden. I know our family always will be grateful to have known him; from him we learned how to accept the bad without complaint when facing the misfortune.

小题1:Why did the author agree to let the man spend the night in his house at last?

A.Because the man said others refused to accommodate him.

B.Because the man said he would not cause much inconvenience.

C.Because the man said he had come from the eastern shore.

D.Because the man said he had been hunting for a room since noon.小题2:How long would it take the man to travel from his home to Baltimore by bus?

A.About 1 hour.

B.About 2 hours.

C.About 3 hours.

D.About 4 hours.小题3:From the text we can know that_____________.

A.the author’s children were kind and friendly to the man

B.the man was fed up with his hard-work and his family

C.John Hopkins Hospital provided rooms-for the patients to live in

D.the author and his family were thought highly of by his neighbors小题4:The author’s family were grateful to know the man because__________.

A.he often brought them fish and vegetables from his garden

B.he paid them money for his staying

C.he taught them how to accept the bad without complaint

D.he stayed only overnight with the writer’s family