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Light travels at a speed which is about a million times faster than the speed of  sound. You can get some idea of this difference by watching the start of a race. If    you stand some distance away from the starter, you can see smoke from his gun      before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light   rays left the moon 1.3 seconds before they reached you. The nearest star is so far  away that the light that you can see from it tonight started to travel towards you    four years ago at a speed of nearly 2 million km. per minute. In some cases, the    light from one of tonight’s stars had started on its journey to you before you were born. Thus, if we want to be honest, we can’t say, “The stars are shining tonight.” We   have to say instead, “The stars look pretty. They were shining four years ago, but    their light has only just reached the earth.” 小题1: Light speed is ______ sound speed A.as fast as B.a million times slower than C.about millions of times faster than D.about a million times faster than 小题2:If you stand 200 meters away from a man who is firing a gun to start a race, you will find out that ______. A.you can hear the sound before you see the smoke B.the sound does not travel as fast as light C.the sound will reach you before the man fires D.sound travels about a million times faster than light 小题3:Sunlight obviously (明显地) ______ than the light of the moon A.has to travel a greater distance B.moves less quickly C.travels much more quickly D.is less powerful(有力的) 小题4:The scientific way of saying 'The stars are shining tonight' should be ______. A.the stars have been shining all the time B.the stars seen tonight will shine four years later C.the stars were shining long ago but seen tonight D.the starlight seen today could be seen four years ago
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A.
正确
B.
错误
【单选题】The main difference between a nurse-manager and a head nurse is that the former ______. ( )
A.
is a member of the Medical Executive Committee of the hospital
B.
has to arrange the work shifts of the unit's nurses
C.
can make decisions concerning the medical treatment of a patient
D.
has full responsibility in the administration of the unit's nurses
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果实类
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根茎类
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贝甲类
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矿物类
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A.
the nurse is talking to
B.
whom the nurse is talking
C.
the nurse is talking
D.
who the nurse is talking
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A.
某机械联接部位脱开
B.
主缸无油或缺油
C.
摩擦片与制动鼓间隙过大
D.
左、右车轮制动蹄回位弹簧拉力相差太大
【单选题】—Does your sister ________ to be an actor ________ a nurse? —A nurse. [     ]
A.
wants, and
B.
want, and
C.
want, or
D.
wants, or
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A.
正确
B.
错误
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不相等
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递增
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