单项选择题

Passage Two What is the most surprising suggestion scientists give

A．Changing the way of spraying crops.
B．Buying some outdoor insect lamps.
C．Using a combination of three insecticide.
D．Trying to attract new insects onto the crops.
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单项选择题
what changes did the reinforced concrete bring to the architecture industry
A．It made the buildings solid and fireproof.
B．It decreased workers’ labor intensity.
C．It shortened the construction period.
D．It beautified the outlook of the buildings.
填空题
C
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