单项选择题

The Earth's crust________.

A．can be classified into two types
B．is formed along the margins of the plates
C．consists of semi-molten rocks
D．is about 70 to 100 kilometers thick

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单项选择题

We can infer from the passage that________.

A．Oates's works might be of some help in studying social problems
B．reviewers criticized Oates because of her realistic style
C．Oates lived in a world full of violence, insanity and loneliness
D．in spite of her little knowledge of car racing, Oates described a race ill her novel

单项选择题

Which of the following might be the best title for this passage

A．The Formation of the Earth.
B．Three Types of Zones of Contact.
C．The Geological and Topographical Features of the Earth.
D．The Formation of the Atlantic Ocean.

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