21£®---Why do you eat all the vegetables but leave         meat untouched?

    ---I’m on         diet.

       A£®a; the                  B£®the; ²»Ìî            C£®²»Ì a            D£®the; a

22£®Sometimes we buy a magazine with absolutely no purpose        to pass time.

       A£®other than           B£®rather than           C£®as well                D£®as if

23£®The new safety problem of contaminated£¨ÊÜÎÛȾµÄ£©milk is much more widespread,      at least 22 dairy companies and their milk products that have appeared nationwide.

       A£®to involve           B£®involved              C£®involving            D£®being involved