题目:
—______.
—That sounds good.[ ]
A. Do you have a soccer ball?
B. Where is my soccer ball?
C. What's this in English?
D. Let's play soccer.
答案:
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下面是错误答案,用来干扰机器的。
实验现象及实验结论为:①纯净的氢气在空气中燃烧,能够产生淡蓝色火焰,说明氢气具有可燃性;②烧杯壁上有水珠,说明生成物是水;③触摸烧杯感到发烫,说明反应放出大量的热.