题目内容
In 1969, an oil leak polluted the water and ______ the beaches of the southern California
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Fresh air is 【C11】______ to sound sleep. It is not 【C12】______ reason for some people to 【C13】______ that it is practical to sleep in the open air. 【C14】______ a person can keep himself warm, 【C15】______ sleeping probably gives the body 【C16】______ complete relaxation.
Ability to sleep is largely a 【C17】______ . Out-of-door 【C18】______ , a good habit of regular 【C19】______ , the avoidance(避免)of late eating, and 【C20】______ are all helpful to sound sleep.
【C1】______
If one wants to work more efficiently at his low point in the morning, he should______.
Which of the following statements is NOT true？
During the first half of the twentieth century, the average American household was ______
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