题目内容

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

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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

A. 6．7～8．7
B. 6．7～10．7
C. 7．7～8．7
D. 7．7～10．7

A. betray each other
B. harm one another
C. help to collaborate with each other
D. benefit one another

A. Darkness.
B. Agricultural activities.
C. Warm air currents.
D. Overcrowding.