问题
单项选择题
下列材料中，采用何种材料桩冠修复后患牙牙根折裂的可能最低（）。
A.镍铬合金桩
B.贵金属桩
C.钴铬合金
D.碳纤维桩
E.与材料无关
答案
参考答案：D
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下列材料中，采用何种材料桩冠修复后患牙牙根折裂的可能最低（）。
A.镍铬合金桩
B.贵金属桩
C.钴铬合金
D.碳纤维桩
E.与材料无关
参考答案：D
| 完形填空. | ||||
| It's a fine morning. There __1__ many people in the park. What are they __2__ in the park? Some __3__ are playing games. Some __4__ are walking __5__ the lake. Some boys are __6__ basketball. Two girls are __7__ a storybook. What __8__ those men? They're __9__ tea under a big tree. Look! Two cats are __10__ the tree. There are some birds in the tree. They want to catch the birds! | ||||
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