According to the man, why is it important to mention that the subjects were randomly selected？
A. The random selection explains why the results were so general.
B. This information allows another researcher to repeat the experiment.
C. The lab assistant included it in the example that the students received.
D. Randomly selected subjects assure researchers of an accurate outcome.
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Why does the professor say this:
A. Because she doesn't understand what the man wants her to do
Because she has finished the discussion about the man's problem
C. Because she wants the man to be more specific about his plan
D. Because she does not want to do what the man suggests
Why did Ernie get a low grade on the last test？
A. He does not understand the material.
B. He is not a very good student.
C. He did not have time to finish it.
D. He was in a hurry to leave the class.
A．mereB．justC．veryD．only
A. mere
B. just
C. very
D. only
A．inB．offC．backD．up
A. in
B. off
C. back
D. up
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