She mought l was talking about her son___________at many，I was talking about my son．
A. whom
B. where
C. which
D. while
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文化遗产地的破坏力主要来自于人为因素及自然因素，其中人为因素的破坏是列入《濒危世界遗产名录》的主因。它们的破坏力来自两个方面？
Because Edgar was convinced of the accuracy of this fact，he__________ his opinion．
A. struck at
B. strove for
C. stuck to
D. stood for
The designing of a satellite in the heavenly environment is not absolutely an easy job.
A. by all means
B. by any means
C. by every means
D. by no means
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