Why not ________ an English Club to practice ________ English?
A:to join; speaking
B:join; speaking
C:join; to speak
D:to join; to speak
读新疆图,回答下题.
取用固体粉末药品一般用____ 或____ ,有些块状固体可用____ .给量筒内液体读数时,视线要____ 水平.