击球
参考答案：
用握在手中的球拍或执拍手手腕以下部位触球。
She brought with her three friends，none of ________ I had ever met before.
A．them
B．who
C．whom
D．these
吸湿后就会变质的药品为
A．维生素CB．磷酸可待因C．氯化铵D．青霉素E．硫酸亚铁
