The tooth is usually divided into three parts ( ). A: Tooth crown B: Tooth neck C: Tooth surface D: Tooth root E: Tooth foot

For soft tooth surface gear transmission, the hardness of the tooth surface should be selected A: Pinion tooth surface hardnesslarge gear tooth surface hardness B: Pinion tooth surface hardness≤large gear tooth surface hardness

以眼还眼，以牙还牙。 A: An eye for an eye and a tooth for a tooth. B: An eye for a eye and a tooth against a tooth. C: An eye for two eyes and a tooth for a tooth.

tooth

A tender tooth is ______.

You need to brush your after . A: tooth, eat B: teeth, eating C: tooth, eating D: teeth, eat

What would the doctor do next? A: He would remove the tooth of Lucy. B: He would wash the tooth of Lucy.

Why did the woman go to the doctor’s a few days ago A: She had a bad tooth taken out. B: She had her new tooth examined. C: She had a false tooth filled in.

Linda would like to have a electronic_____ to clean her_____. A: toothbrush, tooth B: teethboobrush, teeth C: toothbrush, teeth D: teethbrush, tooth

Tom wants his (__) (tooth) clean and white.