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完成家谱(family tree)。
小词典：同学们，你们注意看看这些表家庭成员的单词，多数都是以-er结尾。-er这个结尾常表示人。如上文的mother，father，sister，brother等。除此之外，还有一种是在动词后加-er构成名词的，在语法上，我们称之为单词后缀。如动词teach是表示教、讲授，加上后缀-er，那么教书的人就是老师(teacher)了。另外，后缀-or也可以表人物，如演员actor。此类的词还有很多，以后慢慢给大家介绍。
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（1）在图20中，甲为某磁极附近磁感线的方向和分布的示意图，由图可知，该磁极为 ▲ 极，若在l处放置一个小磁针，当小磁针静止时，其指向应是图乙中的 ▲ .
（2）磁敏电阻阻值的大小随磁场的强弱变化而变，图丁是某磁敏电阻R的阻值随磁感应强度B变化的图象，据图线可知，磁敏电阻的阻值随磁感应强度B的增大而▲ ．图线没有过坐标原点，说明 ▲ .
（3）王强设计了一个可以测量该磁敏电阻R的电路如图丙所示，（其中磁敏电阻所处的磁场未画出）．将该磁敏电阻R放置在磁场中的位置某处，测出电阻后，利用R—B特性曲线可以读出相应的磁感应强度.
①在图甲磁场中1处，测得的数据如图20表中所示，则该磁敏电阻的测量值为 ▲ Ω.
②根据该磁敏电阻的R-B特性曲线可知，1处的磁感应强度为 ▲ T.
③在实验过程中，仅将磁敏电阻从1处移至2处，其它条件不变，那么电流表的示数
▲ （填“增大”、“减小”或“不变”）.
④依据上述方法获得的磁感应强度B的测量值与该点实际值存在不小的误差，为尽可能准确反映空间某点磁场的强弱，你认为在选择磁敏电阻时应注意什么问题？ 查看习题详情和答案>>
用括号内所给动词的适当形式完成下面短文，必要时可加助动词。(请将各小题的答案写在短文后相应的横线上。)
Mr and Mrs Smith were giving a dinner party with 20 visitors seated around a table. Their talk was about who 【小题1】 (have) more self-control(自我控制力 )，men or women.
Suddenly they saw a strange expression ( 表情 ) 【小题2】 (come) across Mrs Smith's face. She said something to the servant(仆人) standing behind her without 【小题3】 (turn) around. The servant quickly put a glass of milk outside the open door.
One of the men said, "I want to know what self-control everyone 【小题4】 (have). While I 【小题5】 (count) from 1 to 300, none of you can move at all. If you do, you【小题6】 (pay) 50. "
The people sat like rocks while the man counted. When he reached 280, a large snake(蛇)【小题7】 (see) moving slowly from the table to the glass of milk.
Mr Smith said, "You 【小题8】 just (show) us an example of self-control, but how did you know there 【小题9】 (be) a snake in the room?"
"I 【小题10】 (not, know) it was, but I knew the milk was for the snake, "the man answered.
"It was lying right on my feet, " said Mrs Smith. 查看习题详情和答案>>
：
（1）注射疫苗后，志愿者出现轻度发热现象，调节机体产热的激素主要有
，维持体温恒定的调节方式是 调节，
体温调节中枢是______________。
（2）若该志愿者注射疫苗后的第15天感染SARS病毒，请在乙图中画出其体内抗体变化曲线。抗体的本质是_________,由_____________直接产生，抗体合成及分泌的途径是________________________________________________________（2分） 。
（3）研究发现SARS病毒的增殖需要逆转录酶，说明SARS病毒的遗传物质是
；从遗传物质分析，研制SARS疫苗困难的主要原因是 。 查看习题详情和答案>>
动词运用(共10小题。计10分)
用括号内所给动词的适当形式完成下面短文，必要时可加助动词。(请将各小题的答案写在短文后相应的横线上。)
Mr and Mrs Smith were giving a dinner party with 20 visitors seated around a table. Their talk was about who 1. (have) more self-control(自我控制力 )，men or women.
Suddenly they saw a strange expression ( 表情 ) 2. (come) across Mrs Smith's face. She said something to the servant(仆人) standing behind her without 3. (turn) around. The servant quickly put a glass of milk outside the open door.
One of the men said, "I want to know what self-control everyone 4. (have). While I 5. (count) from 1 to 300, none of you can move at all. If you do, you6. (pay) 50. "
The people sat like rocks while the man counted. When he reached 280, a large snake(蛇)7. (see) moving slowly from the table to the glass of milk.
Mr Smith said, "You 8. just (show) us an example of self-control, but how did you know there 9. (be) a snake in the room?"
"I 10. (not, know) it was, but I knew the milk was for the snake, "the man answered.
"It was lying right on my feet, " said Mrs Smith.
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