单项选择题

According to the passage, how does the concentration of alcohol in a fetus compare to that in the mother

A．The concentration is more.
B．The concentration is less.
C．The concentration is equal in amount.
D．The concentration cannot be measured.
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单项选择题
It can be inferred that the development of a fetal liver depends on ______.
A．how many months pregnant the mother is
B．how much alcohol the mother has consumed
C．how large the fetus is
D．how well the mother has taken care of the fetus
单项选择题
With the plus ( + ) sign added to the search string, a search engine can ______.
A．omit all the irrelevant information
B．find pages containing all the words or phrases in the search string
C．give you only very limited information
D．sometimes find no hits
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