挂灰烟叶形成的原因之一是（)。A.采收烟叶成熟度不够B.烟叶变黄期烤房内温度忽低,上下波动严重,

Which of the following sentences is grammatically CORRECT？

A．China will further intensify bilateral, multilateral and regional economic cooperation in a long run.

B．My company is a big firm, there nearby is a big market for software in my city.

C．We will never stop less they give up at first.

D．Despite of his opposition, she worked in her own way and started her preparations.

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In recent years, both Americans and Chinese have gained sight of the original vision that brought them together. The italicized word is a(n)______in the sentence.

A．compound word

B．derivation

C．adverb

D．conjunction

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下述阿司匹林作用中哪项是错误的？

A、抑制血小板聚集

B、解热镇痛作用

C、抗胃溃疡作用

D、抗风湿作用

E、抑制前列腺素合成

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烟叶烘烤与烟叶等级质量的关糸,(),。

A.过熟的叶片烤后干物质少,颜色带有青色,弹性变差,油分较少

B.过熟的叶片烤后干物质少,颜色变暗,弹性变差,油分较少

C.变黄期温度过高会导致挂灰

D.千筋期千球温度大幅度下降会导致烤红

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学校卫生标准规定，小学1～2年级学生睡眠时间不宜少于

A.6小时

B.7小时

C.8小时

D.9小时

E.10小时

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