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
When you are looking for videos of humpback whales in the North Atlantic, which of the following search strings can give you the most precise collection of pages according to the passage
A．videos of humpback whales in the North Atlantic
B．"humpback whales" + videos + "North Atlantic"
C．"humpback whales" + videos + "North Atlantic" -Pacific
D．"humpback whales" + videos
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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