幽门螺杆菌感染的途径是：口—口、粪—口途径及医源性传播，如胃镜检查/活检等。()
参考答案：对
Thousands of foreigners were _________ to the Shanghai World Expo the day it opened.
A．attended
B．attained
C．attracted
D．attached
油脂中存在的天然有害物质是（）
A.棉酚
B.芥子苷
C.真菌毒素
D.多环芳烃
E.以上都是
