题目内容：
You should have your teeth checked by a d______ (牙科医生) at least twice a year.
参考答案：
选择题：You should have your teeth checked by a d______ (牙
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Several languages are likely to die ____.
Several languages are likely to die ____.选择一项：a.outb.downc.offd.of
This is change on a scale never before experienced
This is change on a scale never before experienced, bringing with it considerabl
The man d ____ (潜水) for pearls.
The man d ____ (潜水) for pearls.
以下哪一点不是调查问卷应该做到的？选择一项：a.
以下哪一点不是调查问卷应该做到的？选择一项：a.多使用术语或者缩写b.问句的表达简洁易懂c.调查问句有亲切感d.调查问卷简短
概论》课教材以()为重点。A、马克思主义中国化最新理论成果B、中国特色社会主义C、习近平新时代中国特
概论》课教材以()为重点。A、马克思主义中国化最新理论成果B、中国特色社会主义C、习近平新时代中国特色社会主义思想