Roads are slippery when it first begins to rain because:
Roads are especially slippery when it first begins to rain. Rain water initially mixes with oil and grease on the road to form a slippery film. As the rain continues, this mixture will eventually wash away.
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This question's difficulty is Medium
This questions appears in the following tests:
Alabama Practice test 11
Colorado Practice test 4
Delaware Practice test 9
District Of Columbia Practice test 2
District Of Columbia Practice test 12
Mississippi Practice test 13
Nebraska Practice test 2
North Dakota Practice test 10
Pennsylvania Practice test 4
South Carolina Practice test 3