国内信用证结算方式适用于国内企业之间（ ）。
A．因商品交易产生的货款结算
B．劳务供应产生的资金清算
C．行政事业收费
D．证券交易清算
参考答案：A
The factory ______ its waste into the river, but now it deals with the waste in a new way. [ ]
A. used to dump
B. is used to dump
C. used to dumping
D. is used to dumping
When one makes new friends, don't forget _____ old ones. [ ]
A. to put up with
B. losing sight of
C. to keep track of
D. keeping in touch with
