单项选择题

A．a talent
B．a great help
C．a big hindrance
D．a skill
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问答题
Science moves forward ,they say, not so much through the insights of great men of genius as because of more ordinary things like improved techniques and tool.
单项选择题
A．250, 000 jobs.B．25, 000 jobs.C．2, 500, 000 jobs.D．2, 500 jobs.
A．250, 000 jobs.
B．25, 000 jobs.
C．2, 500, 000 jobs.
D．2, 500 jobs.
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