题目内容

What does the passage mainly discuss？

A. Patterns of erosion in different mountain ranges.
B. Forces that made the Grand Canyon.
C. The increasing pollution of the Grand Canyon.
D. The sudden appearance of the Grand Canyon.

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The passage would most likely be found in a textbook on which of the following subjects？

Astronomy
Botany
C. Geology
D. Chemistry

【C2】

A. job
B. behavior
C. deed
D. pursuit

【C9】

A. through
B. toward
C. around
D. to

【C15】

A. Once
B. While
C. Before
D. If