allery"Rivers carve valleys and build plains." The main idea is that rivers:
AStay the same size
BChange the land
CDry up in summer
DCause great floods
Answer & Solution
Correct answer: B. Change the land
1. A topic sentence summarizes the main idea of a paragraph.
2. This sentence says rivers carve valleys and build plains.
3. Both actions change the shape of the land.
4. Size, drying up and floods are not mentioned.
**Why not the others:** Staying the same size, drying up in summer and causing floods are not stated or implied by the sentence.
_Source: Wikipedia, "Topic sentence", section "introduction" (revision 1310330778)_
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