单项选择题

A．They can easily catch fire.
B．They can be easily operated.
C．They are not as safe as gas balloons.
D．They cost too much money.
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单项选择题
A．Come back later.B．Take a chance.C．Turn the page.D．Return the book.
A．Come back later.
B．Take a chance.
C．Turn the page.
D．Return the book.
单项选择题
A．Because children could learn skills such as counting, reading from experience.B．Because children could learn something useful from direct experience.C．Because parents taught their children in the Three R’s .D．Because children taught one another in controlled groups.
A．Because children could learn skills such as counting, reading from experience.
B．Because children could learn something useful from direct experience.
C．Because parents taught their children in the "Three R’s".
D．Because children taught one another in controlled groups.
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