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【单选题】
结构性异染色质是( )。A.
在所有细胞核内永久地呈现缩的染色质
B.
含有高度重复的随体DNA
C.
分布于大多数染色体的着丝粒区、端粒和次缢痕附近,并呈现C带染色
D.
以上都正确
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【单选题】听力原文：W: Did you go to the library, before or after your exam this morning? M: Before. First, I went to the library to review my lessons, and after I had my lunch, I played football before I went home....
A.
Lunch.
B.
Exam.
C.
Review his lessons.
D.
Playing football.
【单选题】What can be inferred from the passage?
A.
11 percent of boys in America smoke before their fourth grade.
B.
Nicotine is a part of cigarette.
C.
Children form. values in the fourth grade.
D.
Parents who cannot stop smoking should force their children to stay away from it.
【单选题】( )又称企业预算线,指在既定的成本和既定的生产要素价格条件下,生产者可以购买到的两种生产要素的各种不同数量组合的轨迹。
A.
无差异曲线
B.
等成本曲线
C.
等产量曲线
D.
生产可能线
【简答题】是在既定的成本和生产要素价格条件下,生产者可以购买到的两种 生产要素 的各种不同数量组合的轨迹。
【单选题】The f i re ____ for three hours before the f i re fighters arrived.
A.
had be e n burning
B.
h ad burned
C.
would have burning
D.
has been burning
【单选题】在既定的成本和既定生产要素价格条件下,生产者可以购买到的两种生产要素的各种不同数量组合的轨迹,称为 ( )
A.
等产量曲线
B.
等成本线
C.
无差异曲线
D.
预算约束线
【简答题】Part A Fill in each blank with one of the words below (A-F). Use each word once. Then write the letter of the word in the space provided. A. then B. second C. also D. one ...
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