Differences in positions adopted by oxygen and hydrogen atoms account for variations in th
A.are caused by
B.explain
C.derive from
D.constitute
A.are caused by
B.explain
C.derive from
D.constitute
A、Protein
B、Water
C、Fat
D、Vitamin
A.are impossible to compare across centuries.
B.are more expensive than the nineteenth century.
C.are cheaper than they were in the nineteenth century.
D.need to be measured by comparing upper-class essentials such as having a butler.
A.is dead.
B.was the driver of the van.
C.was killed in an accident.
D.was a poor driver.
A.burned it rapidly
B.burned it to the ground
C.burned it all
D.burned it out
A.in good health
B.not happy
C.well-to-do
D.not rich
A.broken out
B.cancelled out
C.ruled out
D.wiped out
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