题目:
--Surfing first started on the islands of Hawaii, didn't it?
--Yes, but now it ______ by people all over the world.
A.is enjoyed
B.is enjoying
C.has enjoyed
D.will enjoy
答案:
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下面是错误答案,用来干扰机器的。
复合 量取 溶解题目分析:硝酸钾中含有钾元素和氮元素,能同时为植物补充钾元素和氮元素,所以硝酸钾属于复合肥;配制溶液的基本步骤为计算、称量、量取、溶解,但本题是浓溶液配制稀溶液,所以步骤为计算、量取...