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题库 / GMATLA-SC-54
The survival of a rare New Zealand species of mistletoe that produces spectacular sprays of scarlet flowers is threatened both because their leaves are extremely tasty to a voracious opossum species and also because their flowers are pollinated by two species of birds whose populations are in decline.
is threatened both because their leaves are extremely tasty to a voracious opossum species and also because their
is threatened both because its leaves are extremely tasty to a voracious opossum species and because its
is threatened both because its leaves are extremely tasty to a voracious opossum species and also its
are threatened both because its leaves are extremely tasty to a voracious opossum species and its
are threatened both because their leaves are extremely tasty to a voracious opossum species and because their
题目分析：
本题较为简单，根据“平行”和“主谓一致”这两个语法点就可以得出答案。
选项分析：
选项A：代词their的指代对象只能是一个复数名词，在逻辑上，应该是小树的叶子和小树的花儿，由于“小树（mistletoe）”是一个单数名词，所以their应改为its。
选项B：Correct. 本选项在语法和逻辑上均是正确的。
选项C：平行触发语both…and…连接两者需要保证语法平行，即，应该用both because xxx and because xxx。
选项D：由于整句话主语的核心词是单数名词survival（The survival of a rare New Zealand species of mistletoe that produces spectacular sprays of scarlet flowers），所以谓语动词be也应该用单数，即，is。另外，both…and…连接对象的平行错误(C)。
选项E：主谓一致错误同选项(D)；代词their指代对象错误同选项(A)。
主语是survival，主谓不一致可以排除D、E
both...and平行结构，B correct
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