题目

The next morning I’d just about given myself up for lost _____I was spotted by a ship. A. while                    B. as                        C. though                         D. when 答案：D“种豆南山下，草盛豆苗稀”，豆田里杂草丛生影响豆的产量，草与豆苗之间的关系属于（ ）A．捕食 B．共生 C．寄生 D．竞争