单项选择题

In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the best answer to each question on ANSWER SHEET TWO.
To prevent dental disease, we should take a range of ______ of Vitamin C per day.

A. 25-2,000 milligrams
B. 60-2,000 milligrams
C. 75-2,000 milligrams
D. 80-2,000 milligrams

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单项选择题

单项选择题

In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the best answer to each question on ANSWER SHEET TWO. To prevent dental disease, we should take a range of ______ of Vitamin C per day. 您的浏览器不支持 audio 元素。