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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)。
把mistotle看成mosquito，然后就硬要让后面的主语和flowers对应，jyq你有毒吧？？？
主语是survival，主谓不一致可以排除D、E
both...and平行结构，B correct
SV agreement: a rare species is subj. 所以要用is
parallelism: both... and....
a species of：一种xxx。 例句：a group of animals or plants whose members are similar and can breed together to produce young animals or plants:
Seven species of birds of prey have been observed.
The noun species, referring especially to a group of organisms sharing common characteristics, can be either singular (e.g., that species is purple) or plural (e.g., these species are yellow). This is the convention in scientific writing, and it is usually followed elsewhere.
a species of：一种xxx。 例句：a group of animals or plants whose members are similar and can breed together to produce young animals or plants:
Seven species of birds of prey have been observed.
...这题实在不应该错...