2．The organic farmers do the following things except ________.

　　A．adding fertilizers which are rich in minerals

　　B．changing crops every two or three years

　　C．planting crops in different layers of the soil

　　D．planting grass between crops to prevent the soil from being blown away

　　3．Which statement is WRONG according to the text?

　　A．Long­term use of chemical fertilizers can cause damage to the land.

　　B．Chemicals in food can lead to cancer or other illnesses.

　　C．Organic farming is simply farming without using any chemicals.

　　D．Scientists believe some chemical fertilizers are better for people.

　　4．Which is not the reason why organic farmers prefer natural waste from animals?

　　A．It can keep the food free from chemicals.

　　B．It can keep the air，soil and water free from chemicals.

　　C．It can kill harmful pests.

　　D．It can make the soil richer in minerals.

　　【答案】　1－4　CDBC

　　 confuse vt.使迷惑；使为难；混淆

　　(教材P13)It is important to explain this again or we will confuse the students.

　　再把这一点解释一下非常重要，否则会使学生们感到困惑。

　　(1)confuse A with/and B　　 把A和B混淆

　　(2)confused adj. 糊涂的；迷惑的；混乱的

　　be confused by sth. 对......感到困惑

　　be/get confused about sth. 被......搞糊涂了

　　(3)confusing adj. 令人困惑的；难以理解的