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The term biological clock is applied to the means, which living things 【M1】______

A.
B.
【M1】

【参考答案】

∧ which→by
∧ which→by 解析：固定搭配by the means of...

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Tests Show Women Suited for Space TravelBetween 1977 and 1981, three groups of American women, numbering 27 in all, between the age of 35 and 65, were given month-long tests for space travel purposes.(1)Those women were carefully selected from among many applicants.(2)They were not allowed to smoke or drink alcohol during the tests, and they were expected to tolerate each other's company at close quarters for the entire period. Among others things they had to stand pressure three times the force of gravity and carry out both physical and mental tasks while exhausted from strenuous physical exercise.(3)During that time they suffered backaches and other discomforts.(4)Resuks of the tests suggest that wmen will have significant advantage over men in space.(5)Men's advantages in terms of strength and stamina, meanwhile, are virtually wiped: out by the zero gravity condition in space.

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