腰椎牵引最适用于
A．腰椎管狭窄
B．腰椎小关节紊乱
C．腰椎滑脱
D．腰椎间盘突出症
E．腰背筋膜炎
参考答案：D
根据汉语提示，在语境中补充完整单词，完成句子。
1. We often go to school on _______(平日) by bus.
2. How many ________(计算机) are there in the classroom?
3. We are having a class ________(会议) at the moment.
4. Maria often helps old people ________(穿过) the road.
5. Rose's parents want to rent a house with _________(家具).
已知，（x+y）2=16，（x-y）2=8，那么xy的值是（ ）
A．-2
B．2
C．-3
D．3
