【简答题】His hands and fingernails suggested that he hadnt done heavy manual work in his life-he could have been a rich man. ( Passage 1)
【简答题】A.引物酶 B.连接酶 C.解螺旋酶 D.单链DNA结合蛋白 原核生物复制过程中起稳定已解开单链作用的是 A. B. C. D.
【单选题】一般而言,文件的类型可以根据( )来识别。
【单选题】He walked up and down the room for half an hour, _______ behind him.
A.
with his hands clasping
C.
his hands were clasped
【单选题】He seems to have nothing to do. He always keeps his hands in his ______.
【单选题】酶作为一种生物催化剂,具有下列哪种能量效应