单项填空
21. Eggs are sometimes sold by _____ dozen and apples are usually sold by _____ weight.
A. the; the B. the; / C. /; the D. the; a
22. There is very little ________ in protesting. It won’t help much.
A. help B. meaning C. point D. work
23. You should take of this opportunity and try to make a good impression on them.
A. care B. advantage C. charge D. place
