题目

阅读理解The umbrella is a very common object. It (keep) the rain and the sun off the user. Most umbrellas can be folded up (折叠) so it is easy to carry (they).The umbrella is ancient invention. It (invent) about 4,000 years ago. At that time, an umbrella was used (protect) the user from the sun's rays (光线), The Chinese were the (one) to use umbrellas for protection from the rain.People Europe used umbrellas to protect themselves from the rain by the 16th century, only women used them. This changed Jonas Hanway, a writer, started carrying one in public. He popularised umbrellas for 20.化学与社会、生产和生活密切相关.对下列现象或事实的解释正确是(  )选项现象或事实解释A配制FeCl3溶液时,加入适量盐酸增大Cl-浓度,可以抑制Fe3+水解BCl2通入人品红溶液中,品红褪色Cl2具有漂白性C久置的漂白粉质量减小漂白粉中的Ca(ClO)2转化为CaCO3DAgI可用于人工降雨AgI气化时吸热A.AB.BC.CD.D
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