{{B}}
Text{{/B}} Sleep ,as we know,
is important to us because it helps restore tired organs and tissues in our
body. But how much sleep do we actually need? For most of us,
eight hours seems to be about the right amount.{{U}} (26) {{/U}}we know
that there are many people who get{{U}} (27) {{/U}}perfectly with less
sleep, and some who may even need{{U}} (28) {{/U}}. A great deal depend
on the{{U}} (29) {{/U}}we live. But a good general rule to{{U}} (30)
{{/U}}is to sleep as long as we have to in order to feel happy and be able
to work{{U}} (31) {{/U}}our best when we awaken. There
are actually different{{U}} (32) {{/U}}of sleep. There is a deep sleep
and a shallow sleep. In a shallow sleep our body does not get the same kind of
rest it gets in a deep sleep, so that after eight hours of a{{U}} (33)
{{/U}}sleep we may still feel tired. But a short, deep sleep can be very{{U}}
(34) {{/U}}. Alexander the Great was able to get a
deep sleep{{U}} (35) {{/U}}he needed it. Once, during the night before
an important battle, he remained{{U}} (36) {{/U}}much longer than anyone
else.{{U}} (37) {{/U}}he wrapped himself in a cloak and{{U}} (38)
{{/U}}down on the-earth. He slept so{{U}} (39) {{/U}}that his
generals had to wake him three times to give the{{U}} (40) {{/U}}to
attack! Normally when we go to sleep, our!' sleep center" blocks
off nerves so that{{U}} (41) {{/U}}our brain and body go to sleep.{{U}}
(42) {{/U}}prevents us from wanting to do anything. And the other{{U}}
(43) {{/U}}our internal organs and limbs go to sleep.{{U}} (44)
{{/U}}sometimes only one goes to sleep and the other does not. A very tired
soldier can sometimes{{U}} (45) {{/U}}asleep (brain sleep) and keep on
marching, because his body is not asleep.
【答案解析】根据上文出现的名词rule,此处需要一个动词与之搭配使用,[A]follow“遵循”,与rule搭配使用,构成follow a rule(遵循一个规则);而[C]obey虽然也有“服从,听从”之意,但其后常与 order,instruction等名词搭配使用,不能与rule搭配使用;[B]和[D]两个选项与上下文意义不符。
【正确答案】
D
【答案解析】at one's best为固定搭配,指“处在最佳状态”,此处意为当我们醒着时,能以最佳状态工作。[A]to the best of“就…的能力”[D]for the best“得到令人满意的结果”[C]in one's best“穿着节日盛装”。
【正确答案】
B
【答案解析】[B]levels“层次,层面”,different levels of sleep意为“不同层次的睡眠”。[A]standards“标准,水平”;[C]heights“高度”;[D]storeys“(建筑物)的层次”。