我国气候的主要特征是( )
A:气候复杂多样和海洋气候显著
B:气候类型单一和季风气候显著
C:气候类型单一和海洋气候显著
D:气候复杂多样和季风气候显著
我们在对校园生物种类进行调查时,首先要确定( )
He has ______ for some years, but his _____ still makes us very sad now.