1. The ___ of the spring water attracts a lot of visitors from other parts of the country .

　　A . clash B . clarify C . clarity D . clatter

　　2 . Business in this area has been ____ because prices are too high .

　　A. prosperous B. secretive C. slack D. shrill

　　3. He told a story about his sister who was in a sad ____ when she was ill and had no money.

　　A. plight B. polarization C. plague D .pigment

　　4. He added a ____ to his letter by saying that he would arrive before 8 p.m .

　　A . presidency B . prestige C . postscript D . preliminary

　　5. Some linguists believe that the ____ age for children learning a foreign language is 5 to 8 .

　　A . optimistic B . optional C . optimal D . oppressed