单项选择题

Results of the experiment indicated that ______.

A．patients treated with venom were stung less frequently
B．immunotherapy was effective for all patients
C．immunization took place in 7 out of 12 patients
D．the traditional treatment was as effective as the placebo

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单项选择题

The word fatal in paragraph 1, sentence 1 is closest in meaning to ______.

A．harmful
B．lethal
C．painful
D．disease-causing

单项选择题

With which of the following topics is the passage mainly concerned

A．The role of the railroad in the economy of the United States.
B．Major nineteenth-century writers.
C．The conflict between expanding industry and preserving nature.
D．The railroad as a subject for literature.