补气行血的代表方剂是()
A.当归补血汤
B.参苓白术散
C.血府逐瘀汤
D.补中益气汤
E.补阳还五汤
参考答案:E
端粒酶具有下列哪种酶的活性()
A.RNA聚合酶
B.反转录酶
C.DNA水解酶
D.DNA聚合酶
E.连接酶
I am going to be a newspaper reporter because it's an ____ job. [ ]
A. difficult
B. dangerous
C. boring
D. interesting