How did the researchers test their volunteers?
A By giving everyone nasal drops containing either a cold virus or a particular flu virus.
B By giving everyone a medicine that help lessen the probability of catching cold.
C By giving everyone an injection boosting immune function.
D By investigating everyone’s characteristics, interests and hobbies.
Which of the following is NOT true of traditional university research?()
A. it is free
B. It is profit-driven.
C. It is widely available,
D. It is curiosity-driven.
(2008,7)根据我国《宪法》规定,有权决定个别省、自治区、直辖市进入紧急状态的机关是()。
请选择(4)处的最佳答案。
A. without
B. by
C. from
D. upon