单选题
The accuracy of scientific observations and calculations is always ______ the scientist' s time-keeping methods.
A、
at the mercy of
B、
in accordance with
C、
under the guidance of
D、
by means of
【正确答案】
B
【答案解析】
at the mercy of任凭…摆布。in accordance with依照，与…一致。by means of依靠。under the guidance of在…的指引下。
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