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【单选题】
关于层片的论述,正确的是 ( )A.
大 兴安落叶松群落是单优势林，其乔木层与层片是一致的
B.
层片是按植物的高度划分的
C.
层和层片含义基本相同
D.
群落有几个层次，就有几个层片
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举一反三
【单选题】The final document was, of course, supposed to mend the damage ______ upon the world by the war.
A.
imposed
B.
impressed
C.
compelled
D.
compressed
【单选题】Many people are not fully aware of the damage that it does to their health. This is ____ we chose this picture as our logo.
A.
that
B.
because
C.
why
D.
for which
【单选题】A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
A.
in its turn
B.
in return
C.
in turn
D.
by turns
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