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But they were less good at presenting those pages, which might number in the hundreds of thousands, in a useful way. This sentence in the 3rd paragraph tells us that ______.
A．other search engines are less convenient in use
B．Google is the best search engine
C．there are too many search engine
D．all the search engines are basically the same
单项选择题
From the passage, we know fluoride ______.
A．prevents fracture because it increases bone density
B．is a safe drag to cure osteoporosis
C．makes fracture more possible because it turns bones brittle
D．is widely used to cure fracture
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