PP伴侣 请大牛们好心指导 感激不尽

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PP伴侣
请大牛们为小妹解答好吗? 答案的另一个选项是小妹错误的答案
请大牛们好心指导 感激不尽

Because of _________ diversity, seven separate groupings or divisions of algae have been established by botanists.
(a)    those
(b)    their
Ans: B

Because Mars is farther from the Sun than ___ , Mars takes longer to complete a revolution.
(a)    is from Earth
(b)    Earth is

Ans B

A condenser is a heat exchanger _____steam or vapor loses heat and returns to liquid form .

(a)    in which
(b)    that

Ans: A

Most fisher and many reptiles have ribs along most of the spine , but in mammal ___ only in the chest area.

(a)    they are found
(b)    are found

Ans : A

Although ____ instant critical acclaim in 1952 , he never completed a second novel , publishing many short works instead .

(a)    Ralph Ellison’s first novel , Invisible Man, received
(b)    Ralph Ellison’s first novel , Invisible Man, was received
Ans : A