物质资料的生产是人类社会赖以存在和发展的基础。( )
参考答案：对
克隆羊“多莉”有三个母亲，影响“多莉”长相的主要是
A．提供细胞核的母羊
B．提供去核卵细胞的母羊
C．生出“多莉”的母羊
D．三只母羊共同影响
Some people think that CD-ROMs will soon be _________ books. [ ]
A. as more popular as
B. the most popular than
C. so popular as
D. more popular than
