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【判断题】
有的生态系统中,消费者和生产者相互之间是紧密联系的。A.
正确
B.
错误
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【简答题】Although much remained unaltered, _________ (不容否认) that some significant changes were occurring.
【简答题】The comparative rarity of IOK-1 means that significant changes must have occurred in the universe over the 60 million years that ______.
【单选题】听力原文： In the past century, Taiji Quan has undergone significant changes, with its movements becoming more relaxed and graceful. Many moves requiring explosive strength disappeared. ually Taiji Qu...
A.
The mind should be quiet and conscious but alert.
B.
The mind should be relax and unconscious.
C.
The mind should be quiet and smart.
D.
The mind should be quiet and conscious.
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