9.-----I’ll tell Mary about the new job tomorrow.
----- You ______ her last week.
A. ought to tell B. may tell C. would have told D. ought to have told
8. ____________, she is becoming more and more homesick.
A. She haven’t received letters from home
B. Having not hearing from home
C. Having not heard any letters from home
D. Not having received any letters from home
7. --- Look! You’ve made the same mistake again!
---- Oh! no, not again! ________ such a mistake.
A. I always make B. I’m always making
C. I’ve always made D. I always made
6. While he was at ______ college, he took part in political activities, and was soon thrown into _______ prison.
A. the; / B. /; the C. /; / D. the; the
5. belong A. demand B. hunt C. condition D. anxious
第二节 单项选择(共15小题,每小题1分;满分15分)
4. meant A. mean B. heat C. create D. feather
3. match A. machine B. chemistry C. charge D. character
2. furniture A. prefer B. modern C. labor D. murder
1. agriculture A. graduate B. match C. disappoint D. relative
63.(16分)大部分普通果蝇身体呈褐色(YY),具有纯合隐性基因的个体yy呈黄色。但是,即使是纯合的YY品系,如果用含有银盐的食物饲养,长成的成体也为黄色。这就称为“表型模写”,是由环境造成的类似于某种基因型所产生的表现型。
(1)从变异的类型分析这种“表型模写”属于_ _____,理由是_________ ___ _。
(2)现有一只黄色果蝇,你如何判断它是属于纯合yy还是“表型模写”?(有正常黄色果蝇可利用)
1)请写出方法步骤:
①
②
2)预测结果并写出相应结论:
①
②
(3)果蝇的一个精原细胞中的一个染色体上的DNA分子用15N进行标记,在正常情况下,其减数分裂形成的精子中,含15N的精子数占____ __。
(4)已知果蝇白眼为伴X隐性遗传,显性性状为红眼。现有一对亲本杂交,其子代中雄性全部为白眼,雌性全为红眼,则这对亲本的杂交组合是
河北正定中学高三年级第五次考试
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