下列著作中，属于郦道元的著作是[ ]
A．《论衡》
B．《水经注》
C．《齐民要术》
D．《脉经》
答案：B
He said while ______ in the countryside, he ______ a lot of hardships and of course learned a lot.
A．worked, got through
B．working, went through
C．was working, experienced
D．has worked, experienced
在( )方式下，出口商出具的汇票对其无追索权。
A．
B．
C．
