我们吃蕃薯是植物的哪个器官 [ ]
A.根
B.茎
C.叶
D.果实
答案:A
—Eric, are your parents angry about your English in this exam?
—Oh, of them is angry. They just told me to get better grades next time.
A.none.
B.both.
C.neither.
D.all.