请举例说明无脊椎动物与人类的关系．
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下面是错误答案，用来干扰机器的。
因为并联电阻总电阻的倒数等于各个电阻倒数之和；即1R总=1R1+1R2；则R总=R1•R2R1+R2；由A、B、C、D四个选项可知：四个选项中R1+R2都等于22Ω；故R1•R2越小的则总电阻就越小；A中R1•R2=112Ω2；B中R1•R2=96Ω2...
丁基橡胶可用于制造汽车内胎，合成丁基橡胶的一种单体A的分子式为C4H8，A氢化后得到2-甲基丙烷。 完成下列填空：
（1）A可以聚合，写出A的两种聚合方式（以反应方程式表示）。
_________________________________________。
_________________________________________。
（2）A与某烷发生烷基化反应生成分子式为C8H18的物质B，B的一卤代物只有4 种，且碳链不对称。写出B的结构简式_______________。
（3）写出将A通入下列两种溶液后出现的现象。
A通入溴水：____________________。
A通入溴的四氯化碳溶液：__________________。
（4）烯烃和NBS作用，烯烃中与双键碳相邻碳原子上的一个氢原子被溴原子取代。分子式为C4H8的烃和NBS作用，得到的一溴代烯烃有____种。
已知有耳垂由显性基因A控制，无耳垂由隐性基因a控制，有一对夫妇的基因都是Aa，他们子女的基因可能是（ ）
A．AA，Aa
B．AA，aa
C．AA，Aa，aa
D．Aa，aa
葡萄糖有氧氧化的第1阶段发生部位是
A．胞液
B．线粒体
C．内质网
D．高尔基体
E．细胞核
按照1966年国际载重线公约，某缔约国船舶在大连港装货时应采用（）。
A．夏季载重线
B．冬季载重线
C．热带载重线
D．A或C
I believe honesty is one of the greatest gifts. I know they call it a lot of fancy names these days, like (36) and straightforward. And it’s still what （37）a man a good citizen. This is my secret, and I try to live by. I’ve been in the taxi business for thirty-five years, (38) there is a lot about it that is not so good. Taxi drivers have to be rough and tumble(乱作一团) fellows to be able to take it in New York. You’ve got to be (39) to fight the New York traffic eight hours a day. Because taxi drivers are tough, people get the (40) impression that they are bad. Taxi drivers are just like other people. Most of them will act as (41) fellows. You read in the papers almost every week (42) a taxi driver turns in money or jewels or like that people leave in their (43). If they weren’t honest, you wouldn’t be reading those stories in the papers. One time, I found an emerald（翡翠的） ring in my car. I remembered helping a lady with a lot of suitcases that day, so I went back to where I had (44). It took me almost two days to wait for her in order to return her (45) to her. I didn’t get as much as “thank you.”(46), I felt good because I had done what was right. I think I felt better than she (47). I was born and raised in Ireland until I was nineteen years old. I came to this country in 1913 where I (48) several jobs to earn a few dollars before joining the army in World War I. After being discharged(退伍), I bought my own car and have owned one ever since. It hasn’t been too easy (49), but my wife takes care of our money and we have a good bit (50) for a rainy day(一时之需). In all my years of driving a taxi, I have never had (51) with the public, not even with drunks. Even if they get a little headstrong(顽固的) once in a while, I just agree with them and then they behave themselves. People ask me about tips. As far as I know, (52) everyone will give you something, because most Americans are (53) generous. I always try to be nice to everyone, whether they (54) or not. I believe in God and try to be a good member of my parish（教区）. I try to act toward others like I think God wants me to act. I have been trying this for a long time, and the (55) I try, the easier it gets.
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