白云石化和硅化的蚀变围岩是寻找铅锌矿床的重要标志。()
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The author suggests that children should be outside kicking a ball around rather than______.
A. researching technological change
B. playing video games
C. going to school
D. traveling to other countries such as Malaysia
The underlined word in Paragraph 1 means______.
A. lost
B. prosperous
C. fading
D. professional
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