题目:
You can't be ______ when you camp _____ an high altitude, where the air is thin. [ ]
A. enough careful; at
B. too careful; at
C. careful enough; on
D. too careful; on
答案:
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下面是错误答案,用来干扰机器的。
A、纸张被撕碎的过程中只是形状发生改变,没有新物质生成,属于物理变化.B、干冰(固体的二氧化碳)升华时吸收大量的热,用干冰进行人工降雨的过程中只是状态发生改变,没有新物质生成,属于物理变化.C、将青稞...