题目

实验室久盛石灰水的试剂瓶内壁常附有一层白色污渍，其成分是_______  ，化学式为_______，写出其形成的化学方程式：______          _____               。此污渍_______（填“能”或“不能”）用水洗掉，清除此污渍的方法是__________          ，写出此反应的化学方程式___________ ____         __                   。 阅读理解，阅读下列短文，从各题所给的A、B、C和D项中选出最佳选项。 　　Robots aren't only in the movies or on TV．One “real” robot recently married a couple at a wedding ceremony in Tokyo, Japan． 　　Fifty guests stood as the music played and the bride(新娘)walked down towards the groom(新郎)．Only one guest stayed seated-the minister(牧师), who happened to be a robot．For this special ceremony, the four-foot tall robot named I-Fairy wore flowers around her head．I-Fairy's eyes flashed colored lights as she pronounced the couple man-and-wife and asked the groom to kiss the bride．The wedding was the first time a marriage had been led by a robot, according to the company that built I-Fairy． 　　A robot might seem like an unusual choice(选择)to lead a wedding, but if you knew the couple you would think I-Fairy was the perfect choice．That's because the groom teaches robotics at a university and the bride works for the company that built I-Fairy．The newly married couple hopes their wedding will encourage more uses for robots．They hope their wedding will give people ideas about ways in which they might use robots to do “everyday things” in their lives in the near future． (1) The “real” robot is the ________ at the wedding ceremony． [　　] A． bride B． groom C． reporter D． minister (2) Which is TRUE about the robot? [　　] A． It wore flowers around the neck for the ceremony B． Its eyes flashed colored lights while it was speaking． C． It was built by the I-fairy company． D． It kissed the newly married couple． (3) In paragraph(段落)3, “robotics” must be the ________ on how robots are made and used． [　　] A． science B． book C． magazine D． cartoon (4) We can learn from the last paragraph that ________ · [　　] A． it is very usual for robots to lead weddings B． a robot is the perfect choice for everybody's wedding C． the wedding is expected to encourage people to use robots more D． people get ideas on how to do everything with robots in the near future (5) This passage is a(n) ________． [　　] A． novel B． news report C． folk story D． advertisement