How many students went to the hockey game?（）
A. None of them go to the hockey game.
B. They seldom go to the hockey game.
C. They usually went to the hockey game.
D. All of them went to the hockey game.
（）可治疗头痛、牙痛、大便干燥。
A. 太阳穴
B. 合谷穴
C. 劳宫穴
D. 巨骨穴
单芯电缆绝缘层中最大电场强度位于（）上。
A. 线芯中心
B. 线芯表面
C. 绝缘层
D. 外屏蔽层
骨干树种能形成全城的绿化特色，一般使用的树种为（）种
A. 1-4
B. 5-10
C. 10-20
D. 20-30
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