题目

下列有关物质的用途说法正确的是（ ） ①熟石灰可用来改良土壤酸性 ②氦气可做保护气 ③干冰可作制冷剂 ④蒸馒头时可用NaOH来除去面团中发酵产生的酸 ⑤可用Al（OH）3治疗胃酸过多 ⑥工业上可用Na2CO3来制肥皂 ⑦工业上可用铁桶盛放波尔多液 ⑧家庭中可用NaNO2作调味品． A．②④⑤⑦ B．②③⑤   C．①②③⑤ D．①⑤⑥⑧按要求完成下列句子。1.China is a great country with a long history of 5, 000 years. (改为同义句)China is a great country________ ________a long history of 5, 000 years.2.He likes singers. They write their own songs. (改为含定语从句的主从复合句)He likes singers________ ________their own songs.3.I like English better than math. (改为同义句)I ________ English ________ math.4.Mike likes the movies that make him happy. (改为同义句)Mike likes the movies that ________ him________.5.Linda likes clothes. The clothes are unusual. (改为含定语从句的主从复合句)Linda likes clothes________ ________unusual.