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A.The phone can be more portable.B.The information is more specific.C.Th

A. The phone can be more portable.
B. The information is more specific.
C. The language is simpler.
D. The service is cheaper.

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脊索动物起源的假说有哪些？为何赞同棘皮动物学说的人较多？

A.Grammar．B.Vocabulary．C.Speaking．D.Translation．

A. Grammar．
B. Vocabulary．
C. Speaking．
D. Translation．

鸟类和哺乳类均由古爬行类演变而来，但的发现将鸟类的起源提前了年，表明鸟类是与哺乳类在同一时

When you toss away envelopes containing your bills, you actually feel more anxious about