单项选择题

I was asked the other day whether high and low pressure systems were________the central pressure.

A．maintained to
B．determined by
C．generated within
D．preserved to
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单项选择题
Bob: What are you reading, Frank Tom: It’s this week’s New Scientist, why Bob: I was just wondering—________, but I’ve never actually read it myself. Is it aimed at real scientists or can ordinary people like me understand it
A．it’s for anyone really
B．where I can buy it
C．it seems very expensive
D．it looks interesting
单项选择题
________Alan’s amazement, the passport office was closed when he arrived.
A．With
B．For
C． To
D． Of
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