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【简答题】
成年维持动物的必需氨基酸需要通常为八种：( )、( )、( )、( )、( )、( )、( )和( )。生长猪需十种，除上述八种外还需( )和组氨酸。雏鸡在正常生长时，除上述十种外还需要( )( )( )。
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举一反三
【单选题】After the earthquake, many kind-hearted people did what they could ________ those who suffered from it.
A.
help
B.
helping
C.
to help
D.
helped
【简答题】How many books did Carson write before Silent Spring, and what were their titles? ______.
【单选题】Many teenagers are made _____ what they're not interested in . [ ]
A.
do
B.
to do
C.
did
D.
doing
【单选题】What did the writer learn from books as a child?
A.
About many foreign places.
B.
About many historical figures.
C.
About the outside world as well as her own self.
D.
About the ironies of life.
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