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【单选题】
每次刷牙时间为A.
1分钟
B.
2分钟
C.
3分钟
D.
5分钟
E.
10分钟
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The accuracy of scientific observation and calculations is always at the mercy of the scientist's timekeeping methods.
A.
under the control of
B.
within the kindness of
C.
beyond the reach of
D.
out of the control of
【单选题】When a science is becoming more advanced,
A.
there will be clearer difference among the sciences of various countries.
B.
there will be more scientists compete with each other.
C.
people will increasingly believe in science.
D.
more people will agree on its basic concepts.
【单选题】Which of the following is an example of telecommuting as described in the passage?
A.
A scientist in a laboratory developing plans for a space station.
B.
A technical writer sending via computer documents created at home.
C.
A computer technician repairing an office computer network.
D.
A teacher directing computer to assist learning in a private school.
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