A: is this?
B: It's a cake.[ ]
A. What
B. Where
C. What's
答案：A
“世界人种大熔炉”是指（ ）
A．南美洲
B．北美洲
C．欧洲
D．非洲
I’m protecting myself mosquitoes.
A．from
B．in
C．on
D．at
