菊花有不同的品种,玉米粒有不同的颜色,这都源于生物的 ____ ,生物的相对性状,也是通过 _____ 产生的。
变异 变异
She was scared the yard because she was scared by the big dog at the gate. [ ]
A.to go into; to be bitten; lay
B.of going into; to bite; laying
C.of going into; to be bitten; lay
D.to go into; of being bitten; lying:
下列基质中,哪一类的组成与皮脂分泌物最相近()
A.羊毛脂
B.蜂蜡
C.鲸蜡
D.虫白蜡
E.凡士林