题目

—What made Alice so angry?—________ in the rain for an hour. A . She was kept waiting B . Being kept to wait C . Because of waiting D . Being kept waiting 答案：D下列叙述错误的是（　　） A、点燃甲烷前不一定要事先验纯B、甲烷燃烧能放出大量的热，所以是一种气体燃料C、甲烷可用来制炭黑和氢气D、煤矿矿井要注意通风和严禁烟火，以免发生爆炸事故