A botanist who speaks and writes English is in closer touch with the scientists in other c

问题补充：

A botanist who speaks and writes English is in closer touch with the scientists in other countries thanwho doesn’t．

A. one

B. those

C. /

D. that

答案：

(答案→)A. one

B. those

C. /

D. that

解析：考查代词。One指代可数名词单数，表示泛指。Those指代可数名词复数，表示特指，后面必须有定语修饰。That指代可数名词单数或者补可数名词，后面必须有定语修饰。本题表示泛指一个植物学家。句意：一个能写能讲英语的植物学家要比一个不能讲英语写英语的植物学家更容易与其它国家的科学家保持联系。故A正确。