(﹣a2n)4(﹣a)3÷[(﹣a3)2n×(﹣a)2n+1].
解:原式=a8n(﹣a3)÷[a6n(﹣a2n+1)]
=﹣a8n+3÷[﹣a8n+1]
=a2.
Jim is ______ honest boy in my class. He bought me _____ useful book as a birthday present.[ ]
A. a, an
B. an, a
C. a, a
D. an, an
以下六句话,全部直接表明人性恶的句子的一项是[ ]
①子圉见孔子于商太宰……子圉恐孔子贵干君也……太宰因弗复见也
②今我已亡之矣。我且曰子取吞之
③越远,利以避难
④鲁穆公使众公子或宦于晋,或宦于荆
⑤纣为象箸而箕子怖
⑥鲁人身善织屦,妻善织缟,而欲徙于越
A.①②⑤
B.②③⑤
C.②③⑥
D.②④⑥