单项选择题

The purpose of this passage is to provide you with information on ______.

A．how to reduce the number of hits
B．how to find videos of humpback whales in the North Atlantic
C．the importance of maths in building a search string
D．how to use search engines on the Web more efficiently
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单项选择题
When you have more than one word in your search string, the use of quotation marks can help ______.
A．narrow your search
B．locate the exact information you want
C．get as many hits as possible
D．find all pages containing each of the words in the search string
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
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