27. ___________in the study lost in thought for a long time, I suddenly realized that nothing in the world remains __________.
A. Having sit; unchanged B. To sit; unchanging
C. Sitting; unchanged D. Sitting; unchanging
26. In the thrilling activity of bungee jumping, ________most matters is courage rather than strength.
A. it B. that C. as D. what
25. Mary felt ______from the outside world, since she lacked an Internet connection and couldn’t receive any e-mail.
A. cut down B. cut in C. cut off D. cut out
24. -Do you ______ the idea of living a low-carbon life?
-It sounds tough, but it is a tendency.
A. adjust to B. apply to C. approve to D. subscribe to
23. - When shall we go planting trees in the hill?
-______ it begins to rain, so they don’t need watering.
A. Not until B. While C. Till D. Unless
22. World Expo 2010 Shanghai China, a grand-scale global event, has ______ the significant theme “Better City, Better Life.”
A. abandoned B. adopted C. advocated D. adapted
第一节 单项选择(共20小题,每小题0.5分,满分10分)
21. ______ man may usually be known by the books he reads as well as by ______ company he keeps.
A. The; a B. A; a C. The; the D. A; the
54.(8分)为探索影响动物体内甲状腺激素分泌调节的相关因素,某生物小组作了以下两个实验。
[实验一]每隔三天,将生长正常的成年雄鼠甲的甲状腺做一次等量切除,并不断检测其体内甲状腺激素和促甲状腺激素的含量,结果如右图所示:
图中曲线a表示_______________激素,正常情况下甲状腺合成激素的量与其体积成_____________关系。
[实验二]每隔三天,向生长正常的成年雄鼠乙体内注射一次等量的促甲状腺激素释放激素,同时检测其体内甲状腺激素和促甲状腺激素含量的变化,重复多次。结果发现两种激素含量总是先上升后下降,请分析产生这种生理变化的原因::
当乙鼠体内促甲状腺激素释放激素浓度升高时,刺激_________________合成和分泌的___________________增多,进而促进甲状腺合成并分泌甲状腺激素增多。当甲状腺激素的含量增加到一定程度时,就会______________垂体和______________的合成和分泌活动,从而使相应的激素含量下降。
[实验三]为了验证碘是合成甲状腺激素的原料,某同学进行了如下实验:饲养两只生长状况相同的雄鼠丙和雌鼠丁,给丙鼠每天喂含碘的食物,给丁鼠每天喂不含碘的等量的食物;两只鼠放在不同室内条件下饲养,一段时间后对两只鼠体内的甲状腺激素含量进行测定。
请指出该同学实验中不科学的做法:
①_____________________________; ②_____________________________。
嘉兴市第一中学2009学年第二学期期中考试
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