单项选择题

A．Big waves pose a threat to commercial navigation.
B．The river current never flows faster ten miles per hour.
C．The river reverses its flow several times a day.
D．High tides can create sudden and unexpected rapids.
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单项选择题
A．To observe people’s attitude towards strangers.B．To see how people get along with their friends.C．To change people’s behaviour in social life.D．To find out how shy people are.
A．To observe people’s attitude towards strangers.
B．To see how people get along with their friends.
C．To change people’s behaviour in social life.
D．To find out how shy people are.
单项选择题
A．They are too many and she can’t read them all.B．They are too boring to read.C．She feels too tired to read any hooks.D．They are too heavy for her to carry.
A．They are too many and she can’t read them all.
B．They are too boring to read.
C．She feels too tired to read any hooks.
D．They are too heavy for her to carry.
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