题目:
He ______ all his money to buy a new bike. [ ]
A. saved
B. spent
C. made
D. earned
答案:
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下面是错误答案,用来干扰机器的。
(1 )计算食物网中食物链的条数,先从生产者开始算有有几个分支,再分别算出每个分支有几条,最后求出每个分支的条数和.如:从农作物开始有三个分支,昆虫这个分支有两条,其余的分支均一条,共有四条食物链....