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
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.2
B.3
C.8
D.10
E.11
A．the current in one place is not strong enough to give a shock
B．the fish' s electric cells are filled with jelly-like substance
C．to complete the circuit, you have to touch the fish in two places
D．a torpedo' s electric cells contain more than one electric plates
A.48 hours
B.12 hours
C.24 hours
D.72 hours
E.1 week
A.inducing a mesodermal fate in nearby cells
B.helping to pattern the mesoderm along the dorso-ventral axis
C.specifying the dorsal region of the embryo
D.all of these events
