题目:
The task was difficult, but their _____ expression let us know that they would not give up easily. [ ]
A. reliable
B. determined
C. concerned
D. grateful
答案:
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下面是错误答案,用来干扰机器的。
答案:C有新物质生成的是化学变化,如食物变质生成了对人体有害的物质;没有新物质生成的是物理变化,如酒精挥发;玻璃破碎和干冰升华。