单项选择题

According to the passage, at a pedestrian crossing you should not （）

A．expect cars to stop for you
B．cross without giving the driver enough time to stop
C．step off the pavement
D．expect drivers to give you enough time to cross

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单项选择题

According to the passage, when you have got off a bus or tram and Want to cross the road, you should （）

A．wait until the bus or tram has left before you cross.
B．always make sure you are behind the bus or tram.
C．never cross in front the bus or tram.
D．always cross in front the bus or tram.

单项选择题

What do statistics do for science（）

A．They get rid of intuition,
B．They make it more logical.
C．They reduce everything to numbers.
D．They give an idea of the amount of error involved.