下列生物发展经历的演化过程先后顺序正确的是[ ] A.海生无脊椎动物—爬行动物—

题型:选择题

问题:

下列生物发展经历的演化过程先后顺序正确的是[ ]

A.海生无脊椎动物—爬行动物—两栖动物—哺乳动物

B.海生无脊椎动物—两栖动物—爬行动物—哺乳动物

C.爬行动物—海生无脊椎动物—两栖动物—哺乳动物

D.爬行动物—两栖动物—哺乳动物—海生无脊椎动物

考点:地球的早期演化和地质年代
题型:选择题

下列技术不是在第三次科技革命中出现的有[ ]

A.计算机技术

B.航天技术

C.克隆技术

D.飞机制造技术

题型:选择题

患者,女性,23岁,磨牙银汞充填1周后自述咬物时疼痛,检查:见口腔卫生较好,无牙龈炎症,充填物表面有亮点,叩痛(+),无冷热刺激痛,处理时首选()

A.调磨牙尖

B.调磨充填体

C.牙髓治疗

D.重新充填

E.全冠修复

题型:选择题

PC机中CPU执行MOV指令从存储器读取数据时,数据搜索的顺序是()。

A.从L1 cache开始,然后依次为L2 cache、DRAM和外设

B.从L2 cache开始,然后依次为L1 cache、DRAM和外设

C.从外设开始,然后依次为DRAM、L2 cache和L1 cache

D.从外设开始,然后依次为DRAM、L1 cache和L2 cache

题型:选择题

我国北方地区民居具有的特点是[ ]

A.屋顶坡度较小

B.屋顶坡度较大

C.墙体较薄

D.墙体较高

题型:选择题

阅读理解。

     In a book called Magnificent Obsession, by Lloyd C. Douglas, a description is given of people helping

others but doing it secretly. When difficult problems worried an individual, friends nearby would meet to

discuss possible solutions without the individual knowing their actions. When a solution was agreed upon,

one or two of the friends would carry out the plan and solve the problem secretly, to the great delight of

the worried individual. The helpers would stand by privately, content with their success. No reward was

given to the problem solvers, not even a sincere "thank you", because they were never known.

     This concept is popular today but in a different way. The phrase "pay it forward" is now used when

one person helps another. However, the person helped may not be able to repay the person or group that

helped them. So rather than return the favor to their helpers, they are supposed to help someone else in the

future, which means they pay it forward. It is a sense of responsibility which makes us want to give back

in equal measure to the one who has helped us. But, in this case, the responsibility turns to helping someone

in the future.

     Suppose your elderly grandmother pays part of your schooling. She may tell you there is no need to

repay her because it is a gift from someone who loves you very much. Nothing would please her more than

to have you use her money to get a good education.

     You may never be able to repay her for such a gift. However, she not only gave you some money, but

she provided you with an example that you should also help other people who need it. People with serious

needs are everywhere. Many are children who need better clothes, more books and even better schools.

Some are elderly people who can't afford their medicine or a doctor's care. Consider how you can "pay it

forward" rather than pay money back to your grandmother.

1. The helpers in the book "Magnificent Obsession" were not rewarded because _____. [ ]

A. they hadn't solved the problems thoroughly

B. they had solved the problems secretly

C. they were friends of the worried individual

D. they expected to be paid back in the future

2. The underlined word "pay it forward" means _____. [ ]

A. to repay someone who has helped you

B. to pay someone else who needs help

C. to help someone who has helped you

D. to help someone else who needs help

3. What does the writer suggest with the example of "your elderly grandmother"?[ ]

A. We should learn to respect our grandparents.

B. We should work hard to get a good education.

C. We should also lend a hand to other people in need of help.

D. We should never forget to repay people for their help.

4. From the passage we know _____. [ ]

A. everybody needs help

B. more children need help than elderly people

C. it costs a lot of money to "pay it forward"

D. nowadays many people help others without being repaid

5. By writing the passage, the author wishes people in the world to be _____. [ ]

A. unselfish

B. mysterious

C. honest

D. unforgettable

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