在滑网溜的路面上制动时最容易使车轮打滑，当出现车轮拖带现象，车辆会出现()
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What does Emerson say about the past？
A. It should guide a person"s present actions.
B. It must be examined closely.
C. It is less important than the future.
D. It lacks both clarity and universal truth.
On what basis did Emerson criticize the people of his time？
A. They refused to recognize universal truths.
B. They did not recognize the genius of certain authors.
C. Their convictions were not well-defined.
D. They were too interested in conformity.
What is the main purpose of the lecture？
A. To point out similarities in Emerson"s essays and poems
B. To prepare the students to read an essay by Emerson
C. To compare Emerson"s concept of universal truth to that of other authors
D. To show the influence of early United States society on Emerson"s writing
Why does the professor mention the wood thrush？
A. To contrast its displacement activities with those of other animal species
B. To explain that some animals display displacement activities other than grooming
C. To point out how displacement activities are influenced by the environment
D. To give an example of an animal that does not display displacement activities
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