问题
选择题
Cars do cause us some health problems-in fact far more serious ____ than mobile phones do. [ ]
A. one
B. ones
C. it
D. those
答案
答案：B
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Cars do cause us some health problems-in fact far more serious ____ than mobile phones do. [ ]
A. one
B. ones
C. it
D. those
答案：B
