正确认识和评价自己的关键是什么？ 

【实验一】验证“铁生锈的条件”，设计了如下实验：

【实验药品及仪器】洁净无锈的铁钉、试管、经煮沸并迅速冷却的蒸馏水、植物油、棉花和干燥剂氯化钙．

【实验步骤】：请你补全

蒸馏水煮沸并迅速冷却的目的：____．

由此你获得铁钉生锈的条件为：____．

请你写出自行车构件的防锈方法：车链条：____．车架：____．

写出保护金属资源的一条途径：____；

写出一点金属回收利用的意义：____．

What great means! How did you manage to find       ? It is the first time I         such wonderful means.

阅读下列短文，从每题所给的四个选项（A、B、C和D）中选出最佳选项。

    Four seasons make a year. They a re spring, summer, autumn and winter. 

    Spring is a beautiful season. It's from March to May. In spring, trees turn green and flowers come out. Everything looks new.

    Summer is a happy season. It's from June to August. The weather is hot, so people usually wear cool clothes, go swimming and eat ice cream.

    Autumn is a colourful season. It is from September to November. In autumn, leaves on trees turn yellow. Sometimes they are yellow and red. The colours are beautiful.

    Winter is the last season. It's from December to February. In China, the weather is not the same in winter. In Beijing, it's very cold. It often snows. People often play with snow and go skating in rivers and lakes. Skating is their favorite sport in winter. But in Haihan, it's not very cold. It's very warm. People there can go swimming in the sea.