清初遗民诗人有（）
A.顾炎武
B.黄宗羲
C.王夫之
D.钱谦益
E.吴伟业
参考答案：A, B, C
目前认为基因表达调控的主要环节是（）
A.基因活化
B.转录起始
C.转录后加工
D.翻译起始
E.翻译后加工
After having breakfast, he ______ to the bus stop this morning. [ ]
A. ran off
B. put off
C. took off
D. turned off
