41.下图甲是“观察植物细胞”实验中所使用的普通光学显微镜结构示意图，目镜的放大倍数是10×，两个物镜的放大倍数分别是10×和40×。根据图回答问题（横线上填写文字、括号填写编号)（共7分)
（1)某同学在观察装片前首先进行对光，转动转换器，使图中的物镜[]对准通光孔。然后调整光圈，并转动[]，使光线反射到镜筒内，直到看到白亮的圆形视野为止。
（2)对光成功后，这位同学在显微镜下观察到如乙图所示的洋葱片叶表皮装片的情况。此时物像放大倍数为倍。视野中出现的⑧很可能是。若将视野中的物像⑨移到视野的中央，应将装片向移动。
（3)若物像模糊不清，可转动图甲中的[]使物像更清晰。
43.请根据右图染色体、DNA和基因结构关系图，回答下列问题。（共6分)
（1)染色体存在于细胞结构的中。
（2)构成染色体的主要物质是和，其中遗传物质是。
（3)具有特定遗传信息的DNA片段叫做。
（4)染色体（a)、DNA（b)、基因（c)三者的结构关系是。
A.abcB.bac C.cabD. cba
I was once a fat girl . I weighed 336 pounds and looked as big as my fridge. I was never 1 it. But one day I had a medical examination（体检）. The 2 told me that I was having hea rt trouble. It 3 me up. I began to feel nervous. Then I decided to do something!
In a year and five months, I 4 104 pounds. What a great thing I did ! I didn’t have any expensive food, medical treatment（治疗）or camp-style（训练营式的）exercise. What was the secret to my 5 ？
First I looked through the Internet for do-it-yourself 6 that people could follow on losing weight. Of course I saw countless ads which try to get me to buy their products. But I bought nothing. The only thing I did was to change my bad 7 . The following are what I have done. You can try these. Stop drinking something with too much sugar in it. 8 sweet cakes. Eat green vegetables. Use only vegetable oil. Never eat after 6:30 pm. Also, do light exercise for 15 to 20 minutes five days a week.
Then I kept doing what I should do. People sometimes say,“You don’t need to tell me 9 to do. I know it already!”But the fact is that knowing what to do and doing what you know are totally 10 . The important thing is to know what to do and then just keep doing it.
A.excited about B.worried about C.proud of D.happy withA.doctor B.friend C.mother D.teacher3.A.gave B.cheered C.dressed D.woke
4.A.borrowed B.lent C.lost D.got
A.happiness B.success C.kindness D.richness6.A.advice B.news C.food D.medicine
7.A.grades B.look C.wish D.habits
8.A.Accept B.Bring C.Refuse D.Make
A.how B.what C.why D.whether10.A.easy B.difficult C.similar D.different
42.右图为种子呼吸作用和植物光合作用实验图，请根据图回答问题。（共10分)
（1)瓶中种子萌发时，种子的作用会加强，致使玻璃瓶内气体浓度增大，从而使玻璃罩内幼苗的作用增强。种子在萌发过程中，如果用手触摸盛有种子的玻璃瓶，会感到。
（2)如果把漏斗和玻璃管阀门关闭，幼苗的作用逐渐减弱，原因。
（3)根据上述实验现象，可以看出光合作用和呼吸作用的密切关系，请完成呼吸作用和光和作用的反应式。光合作用的反应式：（)+（)（)（)+氧气叶绿体呼吸作用的反应式：（)+（)（)+（)+能量
（) 2. There is __ chicken in the cupboard. Go and buy some.
A. little B. a little C. few