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【单选题】It __________ eight years to build the Dam(大坝) from 1998 t0 2006．A．spends B．costs C
A.
4．It __________ eight years to build the Dam(大坝) from 1998 t0 2006． A．spends
B.
costs
C.
paid
D.
took
【单选题】How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设),...
A.
The research methods used by scientists.
B.
Observation and human perception variation.
C.
The relation between hypothesis and observation.
D.
The human perceptual mechanism.
【单选题】在Excel中，假设B1、B2、C1、C2单元格中分别存放1、2、6、9，SUM(B1：C2)和AVERAGE(B1，C2)的值等于()。
A.
18，5
B.
10，5
C.
18，10
D.
10，10