题目

I spent fivehours_____________ the book__________ I paid 10 dollars. A.reading; that               B. to read;for that C.read; which                 D. reading;for which   答案：D  淡水水域中，蓝藻大面积爆发会长出讨厌的水华。下列生物中，不属于蓝藻的是（  ） A．蓝球藻          B．发菜           C．念珠藻           D．衣藻