The main purpose of the passage is to
A. offer advice on how to cure a variety of common ailments of astronauts.
B. show the possibility of genome technology use in keeping astronauts fit.
C. discuss the seriousness of most astronauts" different health problems.
D. identify the causes of the genetic damage in the DNA of astronauts.
以研合法制备油脂性软膏时，如药物是水溶性的，宜先用少量什么溶解，再加入羊毛脂吸收后与基质混合()
A. 乙醇
B. 丙二醇
C. 水
D. 丙酮
E. 甘油
Jasper Rines attitude toward Schmidt and Goodwins proposal is
A. scornful.
B. doubtful.
C. ironic.
D. dispassionate.
Which of the following is NOT an effective way for the astronauts to treat the ailments they have？
A. To eat vitamin D to strengthen the bones.
B. To have some blood let out to reduce iron.
C. To take exercises to relieve the back pain.
D. To have folate acid to improve the vision.
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