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【判断题】
正反馈使得生态系统保持平衡,而负反馈则使得生态系统远离原有的平衡状态。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Lucy and (11) (12) in the same(相同的) class．She's (13) ， (14) her Eng-lish (15) very good． She often helps(帮助) me (16) my English． She likes (17) and we play sports together(一起) after school(放学后)． We (1...
A.
I
B.
me
C.
Lily
D.
my
【简答题】He ______(go) to bed. he went to bed a little earlier than usual.
【单选题】He goes to bed late, because he has to get up early every day.
A.
always
B.
never
C.
usually
D.
sometimes
参考解析：
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