题干
These snacks are ________ to your health, so you’d better not eat too much.
A：harmful
B：harmless
C：useful
D：useless
答案(点此获取答案解析）
A
These snacks are ________ to your health, so you’d better not eat too much.
A：harmful
B：harmless
C：useful
D：useless
分子式为C5H10O2的酯共有（不考虑立体异构）