No,It may be helpful but most time you won't understand what you read. It's better to slowly read and understand you're passage.
the answer is B) the author once felt pride and optimism about the war.
'There is some evidence that using mouthwashes does have some clinical benefit in reducing levels of plaque - but only by a bit,' says Professor Damien Walmsley, scientific adviser to the British Dental Association.
They are helpful, they are never going to be a replacement for the mechanical action of a toothbrush for getting teeth and gums clean.'
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