【单选题】Vitamins should not be a _for a healthy diet.

【单选题】Vitamins should not be a _for a healthy diet.
A、substitute
B、healthy
C、substitu
D、nothing
正确答案：A
4【单选题】I think of _as impossible.
A、it
B、this
C、why
D、what
正确答案：A
5【判断题】He appears to be strong and healthy ,but,as a matter of fact.
正确答案：√
12章
1【单选题】You should have worked harder ,then you might not have _the exam.
A、failed
B、fail
C、strong
D、brave
正确答案：A