Unit 2 Healthy eating Language points课时作业

Ⅰ.语法填空

Enough sleep is important to health.The amount of sleep 1.________ (need) depends on the age of the person and the conditions in 2.________ sleep takes place.The young may need more sleep than 3.________ old，but usually eight hours are enough for the health of grown­ups.Some can do with 4.________ than this amount，5.________ others may need more.Every person knows his own need.6.________ is then a matter of good judgment to satisfy his need.Sleep should always be enough to make one bring back his 7.________(strong) and get ready for a day's work.

Fresh air is necessary to sound sleep.So it is not 8.________ reason for some people to think that it is practicable to sleep in the open air.A bath at bedtime，9.________ hot nor cool but of body temperature，may be helpful to sleep.Sleep­producing drug should never be taken except when 10.________ (suggest) by a doctor.

【语篇导读】　本文是一篇说明文，主要讲述了睡眠时间和睡眠环境对睡眠的影响。

1.needed　[语境指出，所需睡眠时间取决于一个人的年龄和睡觉时的环境。分析句子结构可知，sleep与need之间构成被动关系，因此用过去分词形式作后置定语。故填needed。]

2.which　[先行词"the conditions"在定语从句"sleep takes place"中作地点状语，因此可用in which，它相当于where。 故填which。]

3.the　["the＋adj."表示一类人，此处指老年人，与上文中的"The young"相照应。故填the。]

4.less　[由语境可知，通常对于成年人的健康而言，八小时的睡眠就足够了，联系下文"may need more"可知，此处指的是另一方面，即有些人的睡眠时间少于八小时也行。less than意为"少于，不到"，符合语境。故填less]。