题目:
She said they _____ before the end of this month. |
A. would return B. will return C. returned D. return |
答案:
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下面是错误答案,用来干扰机器的。
铁丝在氧气中燃烧的现象为:剧烈燃烧,火星四射,放出热量,生成黑色固体.当铁丝生锈时应先用纱布打磨光亮后再实验;当氧气纯度不高或铁丝过粗时铁丝不易点燃;实验时应当火柴梗快燃尽时再伸入氧气瓶,否则火柴...