单项选择题

A．To see what would happen if the plane exploded in the water.
B．To see how much air passengers need to breathe at certain altitudes.
C．To find out if there are any weak parts that would burst under pressure.
D．To find out how much air can be pumped into a plane.
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单项选择题
A．They make decisions by tossing coins.B．They are not physically separated.C．They think exactly the same way.D．They share most of their vital organs.
A．They make decisions by tossing coins.
B．They are not physically separated.
C．They think exactly the same way.
D．They share most of their vital organs.
单项选择题
A．Return immediately for his parents missed him badly.B．Return immediately for his aunt is expecting him.C．Return immediately for something unusual happened at home.D．Return immediately for somebody seriously ill at home.
A．Return immediately for his parents missed him badly.
B．Return immediately for his aunt is expecting him.
C．Return immediately for something unusual happened at home.
D．Return immediately for somebody seriously ill at home.
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