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【简答题】
设在一条公路上有4辆汽车，分别以30km/h、40km/h、50km/h、60km/h的速度，通过路程长20km的路段，试求该公路上的时间平均车速和区间平均车速，并比较分析两种速度的大小和关系。
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举一反三
【简答题】A．It took her the first seven years. B．It took her four years. C．It took her a good three years. D．It took her six years.
【简答题】 sense of how the US shows humor Living in a new country gives me many surprises. The first surprise was the way that the US people speak. One day I saw someone was having a public speech in a s...
【单选题】It ______ the Chinese people many years to build the Great Wall [ ]
A.
spends
B.
costs
C.
took
【单选题】It took western companies many years to ______ from the oil crisis of the mid-70s.
A.
regain
B.
recover
C.
retain
D.
refresh
【简答题】判断正误。 Readers ( 《朗读者》 ) is a popular TV show in China. It invites people to read aloud on the stage ( 舞台 ). The show also tells moving stories behind those people. They can read everything, like poems...
【单选题】The story ______ many years ago.
A.
take place
B.
took the place
C.
took place
D.
happen
【简答题】 sense of how the US shows humor Living in a new country gives me many surprises. The first surprise was the way that the US people speak One day I saw someone was having a public speech in a sq...
【单选题】. After many years’ hard work, his career really _____ and he became world famous.
A.
took on
B.
took off
C.
took up
D.
took away
【单选题】The author gives the example of Henry Metcalf to show that ______.
A.
older parents should exercise more to keep up with their athletic children
B.
many people are young in spirit despite their advanced age
C.
older parents tend to be concerned about their aging bodies
D.
taking afternoon naps is a good way to maintain energy
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