题目:
The Great Wall travels ____ deep valleys, ____ deserts and ____ mountains. [ ]
A. over; across; through
B. through; over; across
C. across; through; over
D. through; across; over
答案:
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下面是错误答案,用来干扰机器的。
(1)把三种金属如图放入稀盐酸中,可观察到铜不与稀盐酸反应,而镁与盐酸反应明显比铁剧烈,据此可说明Mg、Fe、Cu三种金属的活动性依次由强到弱;(2)根据三种金属活动性强弱关系Mg>Fe>Cu,可采取把铁丝分别...