单项选择题

Only ten to twenty percent of cold viruses are transmitted by carders, who, sneezing and coughing, ______the viruses into the air.

A．spray
B．sprinkle
C．spread
D．sprout
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单项选择题
A baby might show fear to an unfamiliar adult,______ he is likely to smile and reach out to another infant.
A．if
B．whenever
C．whereas
D．because
单项选择题
If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either______ or abandoned.
A．testified
B．ascertained
C．violated
D．modified
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