淀粉中含有谷胱甘肽，其所含（）具有保护维生素C的作用。
A、二烯丙基
B、二正丙基
C、硫氢基
D、亲水基
参考答案：A
Lucy is a very optimistic girl. ______ she is faced with difficulties, she always sees the bright side.
A．Every time
B．Now that
C．As soon as
D．On condition that
对租赁进口货物复运出境的，原进境时根据租金征收的税款不予退还。 ( )
