在采用预收货款方式销售产品的情况下，通常应当在发出商品时确认收人的实现。（）
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As regards walking to school, modern parents seem much concerned with the ______.
A. time spent on the way
B. changes in the route
C. kids' physical strength
D. safety of their children
The dog handlers learned before the searches that ______.
A. each search area contained three target scents
B. there was actually no target scent in the search area
C. some target scents may be labeled with a special mark
D. their dogs were expected to find the scents of red paper
A．outB．upC．offD．in
A. out
B. up
C. off
D. in
A．attributed toB．opposed toC．referred toD．related to
A. attributed to
B. opposed to
C. referred to
D. related to
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