练习：
1. A) express B) explain C) account D) count
2. A) why B) how C) what D) when
3. A) once B) even C) ever D) often
4. A) program B) instruction C) system D) function
5. A)。 success B) sense C) scene D) point
6. A) of B) or C) in D) and
7. A) find B) search C) look D) watch
8. A) way B) play C) rise D) birth
9. A) place B) food C)reference D)information
10. A) orders B) sells C)supports D) serves
11. A) acquire B) ask C) require D) consult
12. A) understanding B) learning C) knowledge D) awareness
13. A) could B) might C)should D) would
14. A) as B) on C)by D) in
15. A) arise B) rise C)consent D) derive
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