全球气候变暖的主要原因是[ ]
A．退耕还林
B．修建梯田
C．陡坡垦荒
D．大量燃烧煤、石油等
答案：D
It doesn’t make much of __________ difference whether he is in __________ favor of the proposal.
A．a; a
B．/; a
C．/; /
D．a; /
核苷水解酶(nucleoside hydrolase)
