In making a scientific experiment, one should not be by temporary setbacks but should stick to doing it hopefully.
A. cast down
B. put away
C. taken in
D. put out
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(答案→)A. cast down
B. put away
C. taken in
D. put out
解析：考查动词短语辨析。句意：在做科学实验中，一个人不应该因暂时的困难而沮丧，而是应该满怀希望坚持到底。所以答案选A、沮丧，难过。B、放好，抛弃，储存；C、吸收，明白，收容；D、熄灭，出版。