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【单选题】
通常认为,肌肉作等张收缩时A.
负荷恒定，速度恒定
B.
负荷恒定，速度改变
C.
负荷改变，速度改变
D.
负荷改变，速度恒定
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举一反三
【单选题】You are buying from the market when you ______ .
A.
borrow a book from the library
B.
look after your children
C.
drive to the seaside for a holiday
D.
dine at a restaurant
【单选题】It’s reported that the police will soon ____ the case of two missing children.
A.
look into
B.
look after
C.
look upon
D.
look out
【单选题】—Excuse me, Miss Wang. Are these my new books? —Yes, please _____ them well. [ ]
A.
look at
B.
look after
C.
look up
D.
look for
【简答题】阅读理解。 Do you dream of having beautiful hair like a model? Well, you can have it if you look after your hair in the right way. To get beautiful hair, you first need to get healthy. So start eating good...
【单选题】Don't worry , the children are now old enough to ______ themselves.
A.
look round
B.
look after
C.
look for
【单选题】Our teacher told us to the new words in the dictionary if we didn’t know them.
A.
look over
B.
look after
C.
look down
D.
look up
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