A:(165°E,20°N)
B:(21°W,5°N )
C:(15°W,25°S)
D:(15°W,25°N)
A. B. C.
生物实验中常常需要设置对照,以下对照设置正确的是( )
——Simon, what do I need to take for the hiking?——You'd better ________ more water than usual. It's hot today.