You can take ____ you like here.
A.which
B.no matter what
C.whatever
D.anything of which
答案:C
计算下面各题.
280+(280-280÷70)
325÷13×(266-250)
下列各项因素中,对种群数量的影响程度不随种群密度变化而变化的是[ ]
A.食物
B.气温
C.传染病
D.天敌