乒乓球中常用的步法一般是：单步、跨步、并步、跳步、（）、跨跳步、小碎步、小跳步、跑动步和换步等等。
参考答案：交叉步
The two companies have reached a partial agreement, but several differences still ___ between them.
A．happen
B．survive
C．appear
D．exist
患者，男，38岁，平时痰多，色灰易咳，饮食睡眠俱佳，舌脉无异常。医生处方多味中药。
下列各项，有毒的药物是（）
A.茯苓
B.苍术
C.半夏
D.白前
E.陈皮
