问题
单项选择题
肿瘤的细胞信号转导异常有（）。
A.生长因子分泌过多
B.生长因子受体过度激活
C.Ras持续激活
D.抑制细胞增殖的信号减弱
E.以上都是
答案
参考答案：E
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肿瘤的细胞信号转导异常有（）。
A.生长因子分泌过多
B.生长因子受体过度激活
C.Ras持续激活
D.抑制细胞增殖的信号减弱
E.以上都是
参考答案：E
| 完形填空。 | |||
| Bob wants to get some money. He finds a job at a shop. Every day he __1__ some work after school. But __2__ Saturday he works __3__ day. Every day after school, he takes a bus to the shop. He __4__ there at 4:00. At the shop he cleans and washes vegetables, __5__ , then puts them in bags. __6__ he sweeps the floor. Bob likes his work. He works __7__ 4 to 6.Then he goes home. He__8__ supper at half past six. After supper he studies. He is usually tired __9__ , __10__ he goes to bed early. | |||
| ( ) 1. A. finishes ( ) 2. A. on ( ) 3. A. the ( ) 4. A. gets ( ) 5. A. eats them ( ) 6. A. Some time ( ) 7. A. at ( ) 8. A. eat ( ) 9. A. before the night ( ) 10. A. So | B. does B. in B. other B. gets to B. puts away them B. Sometime B. on B. has B. after school B. But | C. gets C. for C. all C. comes C. waters them C. sometimes C. from C. does C. before supper C. For | D. has D. at D. a D. comes to D. puts them away D. / D. between D. have D. at night D. And |