题目内容
下肢肌肉运动时，节律性地压迫下肢静脉，其作用是( )。
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原核生物启动子的特点是（）
真核生物的转录特点是
"We must draw lots," the mayor said 22 . "It is the only fair thing." He sat with his hands still 23 his stomach, 24 his watch, but all through the cell you could hear its 25 tick tock tick. He added, " 26 the unmarried. The married should not be 27 . They have 28 ..." Chavel was 29 with a huge and shameful joy. It seemed to him that al- ready he was 30 —twenty-nine men to draw and only two marked papers 31 The chances had suddenly grown in his 32 from ten to one 33 —fourteen to one: the greengrocer had drawn a slip and 34 carelessly and without pleasure that he was 35 They watched him 36 astonishment but without 37 . He was a 38 . They didn’t judge him 39 their 40 standards, he belonged to an 41 class and they didn’t at first even attach the idea of 42 to his actions. A. pressed over B. enmity C. cowardice D. blunt E. filled F. to G. by H. hiding I. left J. favor K. firmly L. On M. with N. own O. included P. gentleman Q. unaccountable R. responsibilities S. indicated T. safe U. saved
RNA上的intron是指
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