正确答案: D

occurred

题目：The development of the light bulb ________partly as a result of the widespread availability of　electricity and the need for cheap, clean light．

解析：考的是语态和时态。讲的是过去的事情，用一般过去时。Development的出现或发生，可用主动态。选项D是正确的。【句子大意】灯泡的发展一部分是由于电力的广泛使用、对便宜和清晰光亮的需求。

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学习资料的答案和解析：

[单选题]主张文章应该“有补于世”、“以适用为本”的文学家是（　　）

王安石

[单选题]“构建社会主义和谐社会”这一科学概念的正式提出是在（　　）

2004年党的十六届四中全会

解析：本题考查“构建社会主义和谐社会” 这一科学概念的提出时间，具有识记性质，注意 牢记。

[单选题]__________

根据以下内容，回答下面的题目。The death of a child, _51_ one’s own child,is something the mind can hardly comprehend．It seems togo _52_ nature．The end of a life that is still forming_53_ has just begun is an almost unthinkable cruelty．But it happens．Parents sometimes must witness the illness and death of the children_54_ whom they gave birth．And _55_ will ever fill theempty place that the dead child leaves behind．Parents_56_ to die before their children, which is the natural order of life events．When the situation is reversed and a child dies _57_ the parents itseems wrong．Yet we never know why one person dies andanother lives．But we do know _58_ a child is gone, theparents still have a future, as grey and worthless as it may at first seem．Death may take the child, but the love never _59_．The sorrow after a child’s death is one ofthe longest and hardest type of _60_ to live with．And ittakes long to deal with the parents’ own emotions．__________

to

[单选题]选择之债是 （　　）

给付可选择

[多选题]使胰蛋白酶原活化的物质是（　　）

肠激酶

胰蛋白酶

[多选题]通过易化扩散的物质有（　　）

葡萄糖、氨基酸

[单选题]月经的发生与下列哪种因素有关（　　）

血液中孕酮和雌二醇水平下降

[单选题]艺术鉴赏过程的首要阶段性环节是__________。 （　　）

审美感受