Two well-developed high pressure areas may be separated by a（）.<br>A:Hill of low pressure<br>B:Trough of low pressure<br>C:Valley of low pressure<br>D:Ridge of low pressure

Two well-developed high pressure areas may be separated by a（）.
A:Hill of low pressure
B:Trough of low pressure
C:Valley of low pressure
D:Ridge of low pressure

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