Children are ________ to meet with challenges as they grow up so parents don't have to worry about i

题干

Children are ________ to meet with challenges as they grow up so parents don't have to worry about it.

A：possible

B：due

C：probable

D：bound

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铅是一种在生物体内难以分解和排出的物质．在一个受铅污染的生态系统中，发现有甲、乙、丙、丁四种生物之间存在吃与被吃的关系，经检测它们体内残留的铅含量情况如表，那么四种生物之间最可能的食物链构成是（）

生物	甲	乙	丙	丁
铅的相对含量	0.04	6.00	0.49	61.00