单项选择题

Which of the following statements is not true （）

A．Some stamps have a flower or animal on one side.
B．Along with a picture on one side, there are also some words.
C．Some used stamps can be worth a lot of money.
D．A stamp, when used, is worth more than a new on

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单项选择题It can be inferred from the passage that （）.

A．a stepladder used to have four legs.
B．it is dangerous to use tools
C．a tripod is safer in a tool design
D．workers are safer on production lines

单项选择题Which of the following is true （）

A．When a child is two years old, he prefers to use both of his hands to grasp objects.
B．Scientists have given the reason for this tendency.
C．A monkey can use both of his hands equally well.
D．Those who prefer to use their left hands live a difficult lif