It can be inferred from the passage that the state constitution of Nebraska was rewritten
A. make the constitution more understandable to the public
B. encourage farmers to leave the state
C. solve difficulties that resulted from loss of crops
D. provide for a regular census of the locust population
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According to the passage, the worst destruction by locusts in the plains area east of the
A. eighteenth century
B. early nineteenth century
C. late nineteenth century
D. twentieth century
Interferon has not been widely used because it is________.
A. still very dangerous
B. not yet available in the United States
C. difficult to produce in large quantities
D. not effective for human beings
用0．10 mol·L-1 NaOH滴定0．10 mol·L-1 HAc时的pH突跃范围为7．7～9．7，由此可知用0．010 mol·L-1 NaOH滴定0．10 mol·L-1 HAc时的pH突跃范围为()。
A. 6．7～8．7
B. 6．7～10．7
C. 7．7～8．7
D. 7．7～10．7
The phrase "function in the disservice of one another" (Lines 7~8, Para. 1) most probably means______.
A. betray each other
B. harm one another
C. help to collaborate with each other
D. benefit one another
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