问题
单项选择题
不能用做含氟牙膏的磨料是()
A.焦磷酸钙
B.人互塑料粉
C.磷酸钙
D.无定形沉淀二氧化硅
答案
参考答案:A
不能用做含氟牙膏的磨料是()
A.焦磷酸钙
B.人互塑料粉
C.磷酸钙
D.无定形沉淀二氧化硅
参考答案:A
选择方框中的句子完成对话 | |
B: In my opinion (观点), 1 . A: I agree with you. But how can we keep healthy? B: I think 2 especially (尤其) green vegetables and fruit. A: Can we eat too much meat? B: No, I think 3 . A: What else should we do? B: We should 4 . But remember not to do sports soon after meals. A: I see. Is 5 for our health? B: It is good. Early to bed and early to rise makes you healthy. |