单项选择题

In this passage the phrase "one atmosphere"( Line 8 )means" （）".

A．the mixture of gases that surrounds any heavenly body
B．one kilogram per square centimeter
C．the feeling among a group or produced by the surroundings
D．producing feelings of mysterious beauty or strangeness

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单项选择题

Which statement of the following is correct according to this passage（）

A．The boiling point of a liquid is the original temperature.
B．The higher the pressure on the surface of the liquid, the quicker the boiling point will be reached.
C．The boiling point of a liquid is 100 Celsius.
D．Both Ｂ and Ｃ.

单项选择题

According to the passage, when was the Welland Canal opened（）

A．1807.
B．1809.
C．1825.
D．1829.