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【单选题】
What can be inferred from the passage about people who are older than 15 years of age?A.
They must have completed all of Piaget's stages of cognitive development.
B.
They are probably in the formal operational state of development.
C.
They have mastered deductive reasoning and are beginning to learn intuitively.
D.
They may still not be able to solve problems systematically.
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【单选题】“芳林新叶催陈叶,流水前波让后波”诗包含的哲理是( )
A.
新事物在本质上优越于旧事物
B.
矛盾是事物发展的动力
C.
事物是本质和现象的统一
D.
事物的发展是量变和质量的统一
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A.
防止发生差错
B.
防止出现配伍禁忌
C.
减少毒性反应
D.
防止降低药物的效价
E.
防止浪费药液
【单选题】--Mike’s bike didn’t work yesterday, so he didn’t go there with his deskmate. --He _________ mine. I wasn’t using it then.
A.
need have used
B.
must have used
C.
could have used
D.
can have used
【单选题】下列表述正确的是（ ）
A.
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B.
发电机是将电能转化为机械能的装置
C.
电动机是将电能转化为机械的装置
D.
电磁继电器是将电能转化为内能的装置
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