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
<上一题 目录 下一题>
热门 试题

单项选择题
According to the second paragraph, the formation of the Atlantic Ocean is the example of ______.
A．spreading contacts
B．the influence of volcanic eruptions
C．converging contacts
D．transform contacts
单项选择题
From this passage we can infer that the author's attitude toward the theory of some geologists (Line 3, Para. 1) is ______.
A．approval
B．disapproval
C．indifference
D．displeasure
相关试题