红腹滨鹬有迁徙习性,常在沙滩、沿海滩涂及河口觅食。下图示意红腹滨鹬迁徙路径,红腹滨鹬繁衍期间,与甲地相比丙地( )
A:昼夜温差较大
B:平均气温较高
C:太阳辐射更强
D:平均风速更大
日常生活中下列物质可以看作是纯净物的是( )
—So many problems! I'm tired. —You should try to them by yourself. You are not a child any longer.