题目

There are many ways for us to reduce (减少) waste. For example, we can reuse paper and plastic bags. We can also recycle newspapers, glass, and cans (易拉罐)      1    new things. Here are some useful      2     to reduce waste.Write on both sides of paperMany people write on only one side of their paper. Why not try using both sides? Some students only use half the pages of their      3    before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to     4      e-cards (电子贺卡) ins一年中，正午太阳高度最大和白昼最长不出现在同一天的地方是（　 ） A.23°26′N　　　　　 B.66°34′N　　　　　 C.10°S　　　　　 D.30°S