According to the second paragraph, a useful theory is one that helps scientists to ______.
A. observe events
B. find errors in past experiments
C. make predictions
D. publicize new findings
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Retail sales volume in local urban and rural areas rose 58 percent and 8 percent, ______,
A. individually
B. respectively
C. correspondingly
D. accordingly
He often quoted "reason over passion" as maxim in ______ the long-standing division among
A. adjusting
B. reconciling
C. conquering
D. consolidating
Social change is easier if it takes place ______.
A. step by step
B. among Black Americans
C. between Black Americans and their white counterparts
D. between Black Americans and other American minorities
Which of the following statements is supported by the passage？
A scientist's most difficult task is testing hypotheses.
B. It is better to revise a hypothesis than to reject it.
C. Theories are simply imaginary models of past events.
D. A good scientist needs to be creative.
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