植物性食物（如剩饭、米粉）引起的食物中毒最可能原因是（）。
A.沙门菌属
B.副溶血性弧菌
C.葡萄球菌肠毒素
D.肉毒梭菌毒素
参考答案：C
B.2＜y＜8
C.3＜y＜5
D.无法确定
There were lots of people _____， and not one of them offered to help.
A．standing watching
B．standing to watch
C．stood watching
D．stood to watch
