Important people don’t often have much free time as their work ________ all their time.
A. takes away
B. takes over
C. takes up
D. takes in
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According to the author, the effective way to spread the use of computers is to teach ________.
A. what computers are
B. how to use computers
C. where computers can be used
D. how computers work
A.awayB.outdoorsC.indoors D.far
A. away
B. outdoors
C. indoors
D. far
Jane was hit on the head by the robber and was knocked ________.
A. mindless
B. unaware
C. brainless
D. unconscious
磷酸盐缓冲溶液()
A. 调节渗透压
B. 调节pH值
C. 调节黏度
D. 抑菌防腐
E. 稳定滴眼剂中加入下列物质其作用是