A sign at the bus stop helps you to know which bus to take.

A sign at the bus stop helps you to know which bus to take.

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生态入侵是指人们有意识或者无意识地把某些生物带入适宜其栖息和繁衍的地区,使得该生物种群不断扩大,分布区不断稳定地扩展,从而危害当地的生产和生

生态入侵是指人们有意识或者无意识地把某些生物带入适宜其栖息和繁衍的地区,使得该生物种群不断扩大,分布区不断稳定地扩展,从而危害当地的生产和生活,改变当地生态环境的过程。根据上述定义,下列各项属于生态入侵的是:A.产于南美洲的凤眼莲作为观赏植物被引进我国,致使云南滇池由于凤眼莲的疯狂蔓延而鱼A.虾绝迹B.科学家将引进的野生大豆与当地品种杂交,培养出抗大豆萎黄病的优良品种C.某实验室因大意将试验用的致

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But Little Smart is not really that smart.

But Little Smart is not really that smart.

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下颌管位于下颌骨内,距牙槽缘较下颌下缘()。

下颌管位于下颌骨内,距牙槽缘较下颌下缘()。

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China is the largest developing country in the world.

China is the largest developing country in the world.

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