试题与答案

英国科学家普利斯特利普做过如图的实验:在甲、乙两个密闭的玻璃容器内,甲中放一只小

题型:问答题

题目:

英国科学家普利斯特利普做过如图的实验:在甲、乙两个密闭的玻璃容器内,甲中放一只小白鼠,乙内放了一盆绿色植物和一只小白鼠.分别给予足够的光照,发现在乙容器中的存活时间长许多.此实验说明光合作用释放氧气.

(1)实验中甲是乙的对照,为使实验更为可靠,这两容器内的小白鼠应该______;

(2)如果用黑布将乙容器完全罩住,那么这只小白鼠存活的时间比没罩时短,这是因为______.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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Musa teaches English at Chunmiao Primary School in Wuhan. He had never heard of China’s idol (偶像) of selflessness before he arrived in the country, but this unusual young man from Nigeria is carrying on the good work of China’s hero soldier.

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The dance showed the spirit of Lei Feng (1940-1962), a soldier who was idolized (作偶像) across China for his selflessness. It was especially meaningful to Musa because the students call him “foreign Lei Feng”.

“I know Lei Feng, he is a good man. Everyone should learn from Lei Feng,” he says.

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B.children of workers from outside Wuhan

C.children from different foreign countries

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A.he is doing good deeds as Lei Feng did

B.he is teaching English at a primary school

C.he is loved and respected by the students

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B.He has an elder sister in his big family.

C.He was a foreign official in Canada.

D.He got a doctor’s degree in a China’s University.

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