The normal human daily cycle of activity is of some 7-8 hours’ sleep alterna

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问题 The normal human daily cycle of activity is of some 7-8 hours’ sleep alternation(交替) with some 16-17 hours’ wakefulness and that the sleep normally coincides 【C1】______ the hours of darkness. Our present 【C2】______ is with how easily and to what extent this 【C3】______ can be modified.
The question is no 【C4】______ academic one.
The ease 【C5】______ which people can change from working !n the day to working at night is a 【C6】______ of growing importance in industry where automation(自动化) 【C7】______ round-the- clock working of machines. It normally 【C8】______ from five days to one week for a person to adapt to a 【C9】______ routine of sleep and wakefulness, sleeping during the day and working at night. 【C10】______ , it is often the case in industry that 【C11】______ are changed every week. This means that no sooner has he got used to one routine 【C12】______ he has to change to another, 【C13】______ much of his time is spent neither working nor sleeping very 【C14】______ .
One answer would seem to be 【C15】______ periods on each shift, a month, or even three months. 【C16】______ , recent research has shown that people on such systems will revert to go back to their 【C17】______ habits of sleep and wakefulness during the week-end and that this is quite enough to destroy any 【C18】______ to night work built up during the week. The only real 【C19】______ appears to be to hand over the night shift to those permanent night workers whose 【C20】______ may persist through all week-ends and holidays. [br] 【C19】

选项 A、barrier
B、embarrassment
C、solution
D、help

答案 C

解析考查语义。此处应意为：“惟一的办法在于……”。barrier意为“障碍”，不符合句意，注意该词常与to连用；embarrassment意为“尴尬”，不符合句意；help表示“帮助”，但很少用于the only help的表达中，一般多见the only one who can help或 the only way that can help...中。Solution意为“解决办法”，符合句意，注意该词后跟名词时，后接协，如：a solution to a problem(问题的解决办法)，类似后须接to作定语的词语还有：key(答案)：answer(答案，回答)；approach(途径：方法)。

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