- What's _____ matter with you?
- I have _____ toothache.
A：a; the
B：the; /
C：/; a
D：the; a
下列叙述中，符合质量守恒定律的是（ ）
I want to view the movie because my friend told me it was very interesting.
下列关于动物在生物圈中的作用的叙述，不正确的是（ ）
