单项选择题

Lacking further hard evidence of the bombing itself, the police could hardly tell who might be responsible（）

A．由于警方难以确定此爆炸事件的负责人，所以进一步的取证工作很难进行。
B．因为对爆炸事件的进一步取证工作很难进行，警方难以确定谁来作负责人。
C．由于对爆炸事件本身缺少进一步的确凿证据，警方无法确定谁有可能是主谋。
D．因为对爆炸事件的进一步取证工作很难进行，警方无法确定谁有可能是主谋。

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We can infer from the last paragraph that（）.

A．economic expansion is fast
B．the business can expand endlessly
C．the end of one business expansion will certainly happen
D．economic rise to the peak is slow

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We can learn from the passage that（）.

A．all the American children have used the latest technology in schools
B．computers and the Internet are very popular with Americans
C．Americans tend to place more importance in the Internet usage than computers
D．the public in America do not hate the Internet problems