人体免疫系统中的B细胞和T细胞（）
A.都能参与特异性免疫过程
B.在同一个体中核DNA携带的遗传信息不同
C.都能识别抗原并产生抗体
D.成熟的场所相同
参考答案：A
解析：B细胞主要参与体液免疫，T细胞主要参与细胞免疫，故A正确；同一个个体中的所有体细胞细胞核中的DNA遗传信息相同，B错误；B细胞和T细胞都能识别抗原，但都不能产生抗体，故C错误；B细胞在骨髓中成熟，而T细胞在胸腺中成熟，D错误。考点：本题考查免疫细胞的起源和功能，意在考查考生理解所学知识的要点，把握知识间的内在联系的能力。
| 阅读下列短文，从每小题所给的四个选项（A、B、C和D）中，选出最佳选项。 |
| If you ask some people: "How did you learn English so well?" you may get a surprising answer: "In my sleep!" These are people who have taken part in one of the recent experiments to test learn-while-you-sleep methods, which are now being tried in several countries, and with several subjects, of which English is only one. Specialists say that this sleep-study method speeds language learning greatly. They say that the average (平均) person can learn two or three times as much during sleep as in the same period during the day — and this does not affect his rest in any way. A word of warning, however, sleep-teaching will only force your head to learn what you have studied already while you are awake. In one experiment, ten lessons were broadcast over the radio continually for two weeks. Each lesson lasted twelve hours — from 8 p.m. to 8 a.m. . The first three hours of English grammar and vocabulary were given with the student awake. At 11 p.m. a sleep song was broadcast to send the student to sleep and for the next three hours the radio whispered the lesson again into his sleeping ears. At 2 a.m. a sharp noise was sent over the radio to wake the sleeping student up for a few minutes to review the lesson. Then soft songs went him back to rest again while the radio went on. At 5 o'clock his sleep ended and he had to go through the lesson again for three hours before breakfast. |
| 1. The learn-while-you-sleep method than other learning methods. |
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| A. can get better result B. is more acceptable C. is more tiring D. is harder |
| 2. By this method, one . |
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| A. starts to learn a new lesson in sleep B. learns how to sleep better C. is made to review his lessons in sleep D. can listen to broadcast while in bed |
| 3. In the experiment, lessons were given . |
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| A. in the night-time B. after soft songs were broadcast C. while the student was awake D. all through the twelve hours |
| 4. Before each lesson finishes, the students has to . |
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| A. get up and take breakfast B. be wakened by a loud noise C. listen to the lesson again in sleep D. review the lesson by himself |