“戴窑中学明智”历史兴趣小组的同学准备去实地探访古代“丝绸之路”，他们不应该去的省份是（   ）       

读一读，写一写。

Sally: Today is Mother's Day. I love my mum. I can buy some flowers for her. What about you, Ken?
Ken: I love my mum too. I can make a photo frame for her. I can say" Happy Mother's Day!" to her. What about you, Linda?
Linda: I like singing. I can sing a song for her. I can give her some lemons.
Today is ____. Sally can ____ for her mum. Ken can ____ for his mum and say "Happy Mother's Day!" to his mum. Linda can ____ for her mum. She can give her mum some lemons too.

中国智慧深深影响了世界。结合所学知识回答：

下图是一组世界区域地图，乙地由于不合理灌溉而引发的主要环境问题是（    ）

比a的2倍多3的数，用含有字母的式子表示是____，当a=2.3时，这个式子的值是____．