问题
单项选择题
初戴全口义齿，前伸牙合时，后牙接触而前牙不接触，这时应调磨
A．上后牙牙尖的近中斜面或下后牙牙尖的近中斜面
B．上后牙牙尖的近中斜面或下后牙牙尖的远中斜面
C．上后牙牙尖的远中斜面或下后牙牙尖的远中斜面
D．加长下前牙
E．上后牙牙尖的远中斜面或下后牙牙尖的近中斜面
答案
参考答案：E
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初戴全口义齿，前伸牙合时，后牙接触而前牙不接触，这时应调磨
A．上后牙牙尖的近中斜面或下后牙牙尖的近中斜面
B．上后牙牙尖的近中斜面或下后牙牙尖的远中斜面
C．上后牙牙尖的远中斜面或下后牙牙尖的远中斜面
D．加长下前牙
E．上后牙牙尖的远中斜面或下后牙牙尖的近中斜面
参考答案：E
In the past，people usually believed what newlyborn babies wanted was food and to be kept warm and dry.They thought babies were not able to ____ things until they were five or six months old.____ the researchers in the United States now believe babies begin learning on their first ____ of life.They say babies are strongly ____ by their environment and one baby will ____ if his or her mother does something that the baby likes. A baby learns to get the best care possible by smiling to ____ her mother.This is how babies start to learn to ___ and communicate with other people.The researchers say this ability to learn ___ in a baby even before birth.They also ____ the idea that newlyborn babies can ____ and understand sounds they heard while they were still ____ inside their mothers. Recently，an American study ____ 112 babies found babies learned better when they were ____.The babies appeared to learn well whether they were sitting up on their own，sitting in seats or __ to sit up.The researchers say keeping that kind ____ had what they called a ____ effect on the babies' ability to learn about objects.They say the body position may be linked to development in the ____．One ____ says babies can pay more attention to ___ an object if they do not have to be worried about their balance.
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