在用餐时,餐巾应该挂在胸前,可以用来擦嘴,但不可以用来擦鼻子。
参考答案:错
The man stopped from time to time_______whether he was being followed.
A.as if found
B.as to find
C.as if to find
D.when found
白血病宜用()
A.高蛋白膳食
B.少渣膳食
C.两者均是
D.两者均否