分离定律和自由组合定律是下列哪位学者提出来的 [ ]
A.达尔文
B.孟德尔
C.沃森和克里克
D.施莱登和施旺
答案:B
Because of the bad management, the company will _____ by another one.
A. be swallowed up B. be swallowed C. swallow D swallow up
奶牛有多少个 * * 和多少个胃?