单项选择题

A．From Land Animal to King of the Sea
B．The Food of the Whale
C．The Whale’’s Ancient Ancestor
D．How Whales Catch Food
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单项选择题
What interests the writer about young children is that they ________.
A．have so many unselfish questions
B．have such long-term ambitions
C．all don’’t want to be spacemen
D．all long for adult pleasures
单项选择题
ADHland ADH2 are same brewers’’ yeasts responsible for breaking down ethanol.
A．Y
B．N
C．NG
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