问题
填空题
矿井火灾必须具备的三要素是可燃物、引火源、()。
答案
参考答案:充足的氧气
矿井火灾必须具备的三要素是可燃物、引火源、()。
参考答案:充足的氧气
从方框中选择最佳选项完成对话,其中有一项多余。 A: Hi, Jim. Let’s play cards. B: That sounds good, ___小题1:______ A: Well, do you have a volleyball ? B: Yes, I have a new volleyball. A: ____小题2:___ B: No, volleyball is so difficult and I can not play it well. A: OK ,let’s watch CBA games. B: ___小题3:___ Hmmm…Let’s play ping-pong! Do you have a ping-pong ball? A: ___小题4:____ But I have only one bat. B: Oh, well…do you have a soccer ball? A: Yes, I do. Let’s play soccer! B: ____小题5:____
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