在下列远古人类中,还使用打制石器,但已经懂得磨制和钻孔技术的是 A、元谋人 B、

题型:选择题

问题:

在下列远古人类中,还使用打制石器,但已经懂得磨制和钻孔技术的是

A、元谋人

B、北京人

C、山顶洞人

D、半坡人

考点:山顶洞人
题型:选择题

内分泌机能减退性疾病的替代治疗,目前较普遍使用的方法是()。

A.补充生理需要的靶腺激素

B.补充药理的靶腺激素

C.补充生理需要量的垂体激素

D.补充药理剂量的垂体激素

E.补充调节神经递质或受体的药物

题型:选择题

古代流传的名曲“十面埋伏”主要由()乐器演奏。

题型:选择题

阅读理解。

     Many years ago, when I was fresh out of school and working in Denver, I was driving to my parents'

home in Missouri for Christmas. I stopped at a gas station (加油站) about 50 miles from Oklahoma City,

where I was planning to stop and visit a friend. While I was standing in line at the cash register (收款台),

I said hello to an older couple who were also paying for gas.

     I took off, but had gone only a few miles when black smoke poured from the back of my car. I stopped

and wondered what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas

station. They said they would take me to my friend's. We chatted on the way to the city, and when I got

out of the car, the husband gave me his business card.

     I wrote him and his wife a thank-you note for helping me. Soon afterward, I received a Christmas present

from them. Their note that came with it said that helping me had made their holidays meaningful.

     Years later, I drove to a meeting in a nearby town in the morning. In the late afternoon I returned to my

car and found that I'd left the lights on all day, and the battery (电池) was dead. Then I noticed that the

Friendly Ford dealership-a shop selling cars-was right next door. I walked over and found two salesmen in

the showroom.

     "Just how friendly is Friendly Ford?" I asked and explained my trouble. They quickly drove a pickup truck

to my car and started it. They would accept no payment, so when I got home, I wrote them a note to say

thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write him and

say thank you, and it meant a lot, he said.

     "Thank you"-two powerful words. They're easy to say and mean so much.

1. The author planned to stop at Oklahoma City _____.

A. to visit a friend

B. to see his parents

C. to pay at the cash register

D. to have more gas for his car

2. The phrase "took off" underlined in Paragraph 2 means "_____".

A. turned off

B. moved off

C. put up

D. set up

3. What happened when the author found smoke coming out of his car?

A. He had it pulled back to the gas station.

B. The couple sent him a business card.

C. The couple offered to help him.

D. He called his friend for help.

4. The battery of the author's car was dead because _____.

A. something went wrong with the lights

B. the meeting lasted a whole day

C. he forgot to turn off the lights

D. he drove too long a distance

5. By telling his own experiences,the author tries to show _____.

A. how to write a thank-you letter

B. how to deal with car problems

C. the kind-heartedness of older people

D. the importance of expressing thanks

题型:选择题

票据保证成立后,在票据保证的当事人之间形成了因保证而发生的票据关系。票据保证的当事人包括______。

A.保证人

B.被保证人

C.被保证票据债权人

D.票据遗失拾得者

题型:选择题

设某产品总产量Q(t)的变化率为


(Ⅰ) 投产后多少年可使平均产量达到最大值并求此最大值;
(Ⅱ) 在达到平均年产量最大值后,求再生产3年的平均年产量.

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