下列各项中，可通过应收账款核算的有（ ）
A．商业折扣
B．赊销商品款
C．代垫包装费
D．代垫运杂费
E．包装物押金
参考答案：B,C,D
用单词的正确形式填空。
1. The wind ___________ (blow) the leaves off the trees in fall.
2. She sometimes ___________ (wear) her red skirt.
3. What a hot ___________ (sun) day!
4. I like ___________ (splash) in the rain.
5. There are four ___________ (season) in a year.
下列四条DNA分子，彼此间具有粘性末端的一组是
A．①②
B．②③
C．③④
D．②④
