海关对进口税费金额不足50元的按50元征收。
参考答案：错
解析： 进出口税费的起征额为人民币50元，不足50元的不予征收。
根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。
小题1:Don't drink the ____________(pollute) water. It will make you ill.
小题2:It’s said that four ____ (nine) of the books have been sold during the last few days.
小题3:It was a great ______ ( lose ) to us all.
小题4:Because he paid no attention to what the teacher said in class, Mark answered the question______ (correct).
（）是施工项目成本分析的基础。
A．分部分项工程成本分析
B．月度成本分析
C．年度成本分析
D．竣工成本分析
