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Believe it or not,the day when you can go to the moon is coming soon.You can go into space (11) space shuttle.It (12) about three days for the shuttle to go from the earth to the moon. The shuttle flies a long way to a space station. You can stay there for a short rest and then it will (13) you to the moon.

Believe it or not,the day when you can go to the moon is coming soon.You can go into space (11) space shuttle.It (12) about three days for the shuttle to go from the earth to the moon. The shuttle flies a long way to a space station. You can stay there for a short rest and then it will (13) you to the moon.
题目:Believe it or not,the day when you can go to the moon is coming soon.You can go into space (11) space shuttle.It (12) about three days for the shuttle to go from the earth to th……继续阅读 »

日常厨房污染主要足( )

日常厨房污染主要足( )
题目:日常厨房污染主要足( ) A.食用油和调料的污染 B.残留农药蔬菜和饮用水的污染 C.空气污染 D.煤气灶和炊具的污染 喵查答案:C ……继续阅读 »

I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( )

I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( )
题目:I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( ) A.莽草酸是氧化物 B.它由碳、氢、氧元素组成 C.氢元素质量分数最小 D.碳、氢、氧原子个数比为7:6:5 喵查答案:A ……继续阅读 »

4. Be quiet! I have________ to tell you.

4. Be quiet! I have________ to tell you.
题目:4. Be quiet! I have________ to tell you. A. something new B. anything new C. new something D. new anything 喵查答案:A 4.A【解析】本句为肯定句用something,排除B、D 项。当something、anything、nothing等不定代……继续阅读 »

下列对化学反应前后质量变化的解释,不符合质量守恒定律的是

下列对化学反应前后质量变化的解释,不符合质量守恒定律的是
题目:下列对化学反应前后质量变化的解释,不符合质量守恒定律的是 A.高锰酸钾受热分解后固体剩余物的质量减小,是因为放出了氧气 B.蜡烛燃烧后质量变小,是因为蜡烛受热形成了石蜡蒸气 C.细铁丝在氧气中燃烧后,质量增大,是因为生成物中含有氧的质量 D.白磷在密闭容器中燃烧,反应前后总质量不变,是因为生成物都没有逸散 喵查答案:B ……继续阅读 »