21. —— How about putting some pictures into the report?
—— ______ A picture is worth a thousand words.
A. No way. B. Why not? C. All right? D. No matter
22. As is known to all, ______ great scientific achievements may have ______ positive effect on our life as well as society.
A. /; a B. the; a C. the; / D. /； /
