题目内容
（请给出正确答案）
The cells (电池) were designed to______sunshine to electricity to run a motor.
A．convert
B．alter
C．modify
D．exchange
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更多“The cells （电池) were designed t…”相关的问题
A．made from
B．made up of
C．made up from
D．made of
A.made from
B.made up
C.made up from
D.made again
There is no creature that does not need sleep or complete rest every day.
If you want to know why, just try going without sleep for a long period of time. You will discover that your mind and body would become too tired to work properly. You would become irritable and find it hard to think clearly or concentrate on your work. So sleep is quite simply the time when the cells of your body recover from the work of the day and build up supplies of energy for the next period of activity.
One of the things we all know about sleep is that we are unconscious in sleep. We do not know what is going on around us. But that doesn't mean the body stops all activity. The important organs continue to work during sleep, but most of the body functions are slowed down.
For example, our breathing becomes slower and deeper. The heart beats more slowly, and the blood pressure is lower. Our arms and legs become limp(柔软的) and muscles are at rest. It would be impossible for our body to relax to such an extent if we were awake. So sleep does for us what the most quiet rest can not do.
Your body temperature becomes lower when you are asleep, which is the reason people go to sleep under some kind of covers. And even though you are unconscious, many of your reflexes(习惯性思维) still work. For instance, if someone tickles(使觉得痒) your foot, you will put it away in your sleep, or even brush a fly from your forehead. You do these things without knowing it.
If you don't have as much sleep as your body needs, you will ______.
A．work properly
B．think clearly
C．keep your attention on your work
D．easily get angry
Primary batteries of cells are those that, once ______, are discarded.
A．to be discharged
B．being discharged
C．discharged
D．discharging
A.concentration of kalium ion
B.white blood cells
C.thrombogen
D.platelets
E.red blood cells
Aging is not a disease, but as a person passes maturity, the cells of the body and the【39】they form. do not function as well as they【40】in childhood and adolescence (青春期). The body provides less【41】against disease and is more prone【42】accident.
A number of related cause may【43】aging. Some cells of the body have a fairly long life, but they are not【44】when they die. As a person ages,【45】of brain cells and muscle cells decrease,【46】body cells die and are replaced by new cells. In an aging person the【47】cells may not be as viable (能生存的) or as capable【48】growth as those of a young person.
Another【49】in aging may be changes within the cells【50】. Some of the protein chemicals in cells are known【51】with age and become less elastic. This is why the skin of old people wrinkles and【52】. This is also the reason old people【53】in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as RNA, store and【54】information that the cell need. Aging may affect this【55】and change the information carrying molecules so that they do not transmit the information as well.
(66)
A．use to
B．be used to
C．used to
D．had
Under a microscope , muscle cells appear to be ______ .
A．textured like wood
B．colored like wood
C．smooth and red
D．short and thick
A.PLMN
B.MSC/VLR Service Area
C.Location Area
A.blood pressure
B.blood vessel
C.blood sugar
D.blood type
A.melanocytes in the skin
B.mesoderm of the face and skulll
C.peripheral nervous system
D.all of these
