Tell your friend not to take the pills _______ he may have health problems in the future, _______ it is too late.
A:cause; which
B:that; when
C:because; when
D:that; which
叶圣陶先生曾这样描述爬山虎:“那些叶子铺在墙上那么均匀,没有重叠起来的,也不留一点儿空隙”.从生物学角度分析,这种现象体现了哪一种非生物因素对生物的影响?( )
“生物圈Ⅱ号”实验的最终结果证明,人类不能建造一个适合人类生存的环境.
____,____;临帝子之长洲,得天人之旧馆。