问题 单项选择题

马钱子类药物主要的有毒成分是( )。

A.乌头碱
B.士的宁
C.二硫化二砷
D.马兜铃酸
E.强心苷

答案

参考答案:B

解析:[试题解析] 本组题考查要点是“各种有毒中药的成分”。选项A乌头碱是乌头类药物的主要有毒成分。选项B士的宁是马钱子类药物的主要有毒成分。选项C二硫化二砷是雄黄类药物的主要有毒成分。选项D马兜铃酸是马兜铃、天仙藤、寻骨风等药物的主要有毒成分。选项E强心苷是黄花夹竹桃的主要有毒成分。

阅读理解

阅读理解。

     About six years ago I was eating lunch in a restaurant in New York City when a woman and a young boy

sat down at the next table. I couldn't help overhearing parts of their conversation. At one point the woman

asked, " So, how have you been?" And the boy, who could not have been more than seven or eight years old,

replied, "Frankly, I've been a little depressed lately."

     This incident stuck in my mind because it confirmed my growing belief that children are changing. As far

as I can remember, my friends and I didn't find out we were "depressed" until we were in high school.

     The evidence of a change in children has increased steadily in recent years. Children don't seem childlike

anymore. Children speak more like adults, dress more like adults and behave more like adults than they used

to.

     Whether this is good or bad is difficult to say, but it certainly is different. Childhood as it once was no

longer exists, why?

     Human development is based not only on innate (天生的) biological states, but also on patterns of access

to social knowledge. Movement from one social role (作用) to another usually involves learning the secrets of

the new status. Children have always been taught adult secrets, but slowly and in stages: we tell sixth graders

things we keep hidden from fifth graders.

     In the last 30 years, however, a secret-revelation (揭示) machine has been brought in 98 percent of

American homes. It is called television. Television passes information to all viewers alike, indiscriminately (不

加区分地). Unable to resist the temptation, many children turn their attention from printed texts to the less

challenging, more vivid moving pictures.

     Communication through print, as a matter of fact, allows for a great deal of control over the social

information to which children have access. Reading and writing involve a complex code of symbol that must

be memorized and practiced. Children must read simple books before they can read complex materials.

1. Traditionally, a child is supposed to learn about the adult world ____.

A. through contact with society

B. naturally and by biological instinct (本能)

C. gradually and under guidance

D. through exposure to social information

2. The phenomenon that today's children seem adult like is due to ____.

A. the widespread influence of television

B. the poor arrangement of teaching content

C. the fast pace of human intellectual development

D. the constantly rising standard of living

3. Why is the author in favor of communication through print for children?

A. It enables children to gain more social information.

B. It develops children's interest in reading and writing.

C. It helps children to memorize and practice more.

D. It can control what children are to learn.

4. What does the author think of the change in today's children?

A. He feels amused by their premature (早熟) behavior.

B. He thinks it is a phenomenon worthy of note.

C. He considers it a positive development.

D. He seems to be upset about it.

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