题干

有一瓶无色气体,可能含有H2S、CO2、HCl、NO2、SO2中的若干种,将其通入氯水中,得无色透明液,将此溶液分成两份,向其中一份加入盐酸酸化的BaCl2溶液有白色沉淀;向另一份中加入HNO3酸化的AgNO3溶液有白色沉淀产生,则下列结论正确的是(   )

A:肯定有CO2和SO2

B:可能有NO2、CO2

C:肯定没有NO2、H2S、HCl

D:以上结论均不正确

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D

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请认真阅读下面短文,从短文后各题所给的A、B、C、D四个选项中,故答案选出最佳选项。

    The news of Stephen Hawking's death came a great shock to the whole world. To his family, he was “a great scientist and an extraordinary man whose work and legacy(遗赠)will 1 for many years”.

    His parents, both Oxford graduates, placed a high  2 on education and family members were often seen reading books at dinner. 3 known at school as “Einstein”, Hawking was not 4 successful academically. With time, he began to show talents for scientific subjects and decided to read  5 at university. As mathematics was not  6at Oxford then, Hawking chose physics instead.

    Diagnosed with a rare motor neurone disease, Hawking eventually 7 a wheelchair. Though shocked and bitter, Hawking continued his work in physics  8. After the loss of his  9, he communicated through a speech-generating device, which  10 him to produce A Brief History of Time with the help of an assistant.

    Hawking once  11how he felt when first informed of his disease,  12 that he would never realize his potential. “But now, 50 years later, I  13 be more satisfied with my life,” he said.

    Hawking also gained popularity  14 the academic world and appeared in several TV shows. He was featured in the film The Theory of Everything, which  15 his rise to fame and relationship with his first wife, Jane.

    Prof James Hartle, who once worked with him ,praised his unique ability to see through all the clutter(混乱)in physics and get to the  16.” My 17 of him would be…first as a scientist and, second, as a human being whose story is a victory  18 misfortune, which inspired a lot of people.” Prof Jim Al-Khalili pictured Hawking as a  19 person. “He was a fun loving guy. Inside that paralyzed body was someone full of  20 for life,” he said.