单选题When crossing a front,isobars tend to（）.Achange from smooth curves within the air mass to sharp bends at the frontBchange from sharp bends within the air mass to smooth curves at the frontCpass smoothly across the front with no changeDbecome closer together at the front and pass through in straight lines
单选题
When crossing a front,isobars tend to（）.
A
change from smooth curves within the air mass to sharp bends at the front
B
change from sharp bends within the air mass to smooth curves at the front
C
pass smoothly across the front with no change
D
become closer together at the front and pass through in straight lines
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