单项选择题

You shouldn't violate the federal law by ______ the smoke detectors in this cabin.

A. locating
B. injuring
C. disqualifying
D. damaging
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______ you'd like to be a new member, please submit your personal information below.
A. If
B. Owing to
C. Although
D. Should
单项选择题
Total research and development expenditure for the area of waste ______ has steadily increased for the past 3 years.
A. construction
B. currency
C. abundance
D. disposal
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