从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. Not only will help be given to the disabled to find jobs, but also medical _____ will be provided for those who need it.
A. prescription B. procedure C. treatment D. practice
22. All brands of milk powder containing the harmful chemical have been _______ by the manufacturers.
A. called off B. called up C. called in D. called out
