动物多样性实质上是指[ ]
A．基因的多样性
B．染色体的多样性
C．细胞的多样性
D．环境的多样性
答案：A
It's high time you had your hair cut; it's getting ________. [ ]
A. too much long
B. much too long
C. long too much
D. too long much
CAPP表示（）
A.计算机辅助设计
B.计算机辅助制造
C.计算机集成制造系统
D.计算机辅助工艺规程设计
