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【单选题】
按照化学结构来分类,叶绿素属于 ( ) 。A.
四吡咯衍生物
B.
二烯衍生物
C.
多酚衍生物
D.
酮类衍生物
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皮皮学刷刷变学霸
举一反三
【简答题】A．She works very hard. B．She thinks that doing housework is their responsibility. C．She is the owner of the house. D．She is not the only owner of the house.
【单选题】Don't be hard on her—she is very ______ and she may start to cry.
A.
sensible
B.
sensitive
C.
sympathetic
D.
sophisticated
【单选题】—Mary is very clear and studies very hard. — she stands out in almost all her subjects that she learns.
A.
No doubt
B.
No problem
C.
No way
D.
No wonder
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