请从B栏中找出A栏的答语，并将其代号填入相应的括号内。
( ) —What’s he doing? —He’s _________ books. A. read B. reading C. reads
( ) I like _________ best, because it’s hot, I can swim and eat ice cream. A. fall B. summerC. spring
( ) — Where does the rain come from? — It comes from the______. A. soil B. clouds C. sun
( ) Stop at a _________ light. A. redB. yellowC. green
( ) An elephant is much _________ than a mouse. A. longer B. bigger C. smaller
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