问题
选择题
Although I failed several times, my father encouraged me ____ another try. [ ]
A. having
B. to have
C. had
D. have had
答案
答案：B
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Although I failed several times, my father encouraged me ____ another try. [ ]
A. having
B. to have
C. had
D. have had
答案：B
汉江市政府为响应党中央建设社会主义新农村和节约型社会的号召，决定资助部分农村地区修建一批沼气池，使农民用到经济、环保的沼气能源．红星村共有360户村民，村里得到34万元的政府资助款，准备再从各户筹集一部分资金修建A型、B型沼气池共20个．两种型号沼气池每个修建费用、可供使用的户数、修建用地情况见下表：
（1）求y与x之间的函数关系式； （2）试问有几种满足经上要求的修建方案？ （3）平均每户村民筹集500元钱，能否满足所需费用最少的修建方案． |