A．Over 50% of those living there do not have relatives.

　　B．A personal visit brings happiness to a sick boy.

　　C．Children live a lonely and frightening life.

　　D．Children love listening to volunteers’ reading.

　　4．The best title for the passage would be________.

　　A．Giving of oneself cheers others

　　B．Volunteering is a way of life

　　C．Volunteering during the holidays

　　D．Giving is better than taking

　　B

　　(2016·合肥第二次质量检测)

　　Wisdom teeth are normally the last teeth to appear.This usually happens when people are in their late teen years or early twenties，in other words，when they are older and wiser.

　　Wisdom teeth can grow into place normally and never cause a problem.But often there is not enough room for them in the mouth；they might crowd other teeth.Sometimes they even push sideways through the gums (齿龈)．

　　An impacted wisdom tooth is one that fails to completely rise through the gums.Wisdom teeth that only partly break through can leave space for bacteria to enter around the teeth.Infection (感染) is a risk in these cases.

　　Wisdom teeth that are not well lined and become impacted are often removed.The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.Removal is also advised if there is a chance that wisdom teeth ate poorly lined.The best time to remove is before the teeth cause any problems or pain.Young adults are the best candidates for wisdom teeth removal.

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