单项选择题 The author’s final solution to the problem discussed in the passage is ________.A) to put up with whatever service is providedB) to make strong complaints wherever necessaryC) to fully utilize all kinds of coin-eating machinesD) to go where good service is available

单项选择题 罗氏沼虾白尾病爆发时，应采用的方法是（）

单项选择题 异尾异斧虫的宿主是（）