27.______ some injuries to his face and hands, he broke both legs.
A. Except B. Except that C. But for D. Apart from
26._____ a pity that I forgot to bring your dictionary.
A. It’s B. This is C. That’s D. There’s
25.We were told to have our reading room_____ after school.
A. clean B. to clean C. cleaning D. cleaned
24.Only if you put your heart into your learning,_______.
A. can you succeed B. you can succeed C. that you can succeed D. can that you succeed
23.The girl ______ in red is a friend of mine.
A. dressed B. dressing C. dresses D. dress
22.Mr Smith stood up in defence of the 16-year-old boy, saying that he was not the person ______.
A. blamed B. blaming C. to blame D. to be blamed
第一节:单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中选出可填入空白处的最佳选项,并在答题卡上将该项涂黑。
21.---Do you know _______?
----Sorry, I’ve no idea.
A .the word means B. that the word means C. what the word means D. what does the word mean
33.玉米植株的性别决定受两对基因(B-b,T-t)的支配,这两对基因位于非同源染色体上,玉米植株的性别和基因型的对应关系如下表,请回答下列问题:
基因型 |
B和T同时存在 (B_T_) 雌雄同株 |
T存在,B不存在 (bbT_) 雄株 |
T不存在 (B_tt或bbtt) 雌株 |
(1) 基因型为bbTT的雄株与BBtt的雌株杂交,F1的基因型为________,表现型为_______;F1自交,F2的性别为_________,分离比为________.
(2) 基因型为________的雄株与基因为_________的雌株杂交,后代全为雄株。
(3) 基因型为________的雄株与基因型为_________的雌株杂交,后代的性别有雄株和雌株,且分离比为1:1。
九江一中高二生物月考试卷2010.10 (分离定律和自由组合定律)
32.某植物的花色由两对自由组合的基因决定。显性基因A和B同时存在时,植株开紫花,其他情况开白花。请回答:
开紫花植株的基因型有 种,其中基因型是 的紫花植株自交,子代表现为紫花植株∶白花植株=9∶7,基因型为 和 的紫花植株各自自交,子代表现为紫花植株∶白花植株=3∶1,基因型为 的紫花植株自交,子代全部表现为紫花植株。
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