单项选择题

Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — Vitamin C.

A．have taken
B．have been taking
C．have been taken
D．have being taken
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单项选择题
Every year, one student in our high school wins a scholarship that ______ one year of college.
A．improves
B．subsidizes
C．obliges
D．subscribes
单项选择题
Question 22 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news.
A．high-tech genetic modification.
B．Thai researchers.
C．the help of some experts from China.
D．natural means.
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