Small sailboats can easily turn over in the water .
A. if not managed carefully
B. if are not managed carefully
C. unless not managed carefully
D. unless are not managed carefully
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(答案→)A. if not managed carefully
B. if are not managed carefully
C. unless not managed carefully
D. unless are not managed carefully
解析：考查状语从句的省略。当状语从句的主语和主句的主语一致的时候，可以把状语从句的主语和系动词一起省略，本题if的后面省略了they are.句意：如果没有被小心处理，小小的船很容易就会翻掉。故A正确。