单项选择题

What can we infer from Paragraph 3

A．Owing to many dynamic factors, the earth's shape changes.
B．Owing to the passage of time, the earth's shape changes.
C．Owing to being not a perfect oblate sphere, the earth's shape changes.
D．Owing to ocean tides, the earth's shape changes.

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单项选择题

From the development history of the toy we can know that ______.

A．it was the first product that appeared in an advertisement on TV
B．it was entirely made of plastic in 1960
C．many forms of it have been designed before 1982
D．it is not one kind of toy any more at last

单项选择题

According to the last paragraph, the role played by Mr. Potato Head is______.

A．a simple children's toy
B．everyone's best friend
C．an entertainment star
D．a popular cultural symbol