第一节单项填空(共15小题；每小题1分。共15分)
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Thank you for sending us_______ fresh vegetables of many kinds. You have done us _______ great service.
A. /；a B. the；a C. /；/ D. the；/
22. — Would you like Alice or Jane to do the task?
—_______ is up to it. I’m sure they have the ability.
A. None B. Both C. Neither D. Either
