支队级单位（）进行一次思想政治教育考核。
A、每月
B、每季度
C、每半年
D、每年
参考答案：C
The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]
A．totals; has been produced
B．totals; is produced
C．totals; are produced
D．total; are being produced
关节外伤脱位常发生在（）
A.肘关节
B.肩关节
C.踝关节
D.腕关节
E.胸椎
