人类的生产和生活都离不开金属。 
（1）金属元素在自然界中分布很广，地壳中含量最多的金属元素是____；
（2）铁是应用最广泛的金属，铁制品非常容易锈蚀，写出用盐酸除铁锈的反应方程式____ 请你提出一条防止铁制品锈蚀的方法____
（3）废旧电池中含有汞，随意丢弃会造成污染，威胁人类健康。汞的元素符号____，它不同于其他金属的一点物理性质是____。

We have great fun____(cycle)around Chengdu!

阅读表达

请根据图表和文字信息，完成短文。每空不超过两个词。

                           Amount of Electricity Used

This graph show the amount(数量) of electricity used in a small city. It is clear that the city uses more electricity in____  than in ____ . In summer, people use the most electricity at 12 p.m. This is probably ____ the high temperature at noon. In winter, people use the most electricity at____  The graph also shows the amount of electricity used ____ from 6 a.m. to 12 p.m. The amount of electricity use decreases (减少)from 6 p.m. to 12 a.m.

黄海海战后李鸿章命全部舰只进旅顺港自保，导致北洋舰队全军覆没。

错误：____

改为：____