11. The ____ temperature of human body is 98.6 degrees Fahrenheit.
（A） ordinary （B） natural （C） normal （D） average
12.To be healthy， one must have a（n） ____ diet.
（A） plenty （B） adequate （C） much （D） little
13. Students or teachers can participate in excursions to lovely beaches around the island at regular ____.
（A） gaps （B） rat （C） length （D） intervals
14. Physics is ____ to the science which was called natural philosophy in history.
（A） alike （B） equivalent （C） likely （D） uniform
15. There‘s a man at the reception desk who seems very angry and I think he means ____ trouble.
（A） making （B） to make （C） to have made （D） having made
16. After the Arab states won independence， great emphasis was laid on expanding education， with girls as well as boys ____ to go to school.
（A） to be encouraged （B） been encouraged （C） being encouraged （D） be encouraged
17. The new appointment of our president ____ from the very beginning of next semester.
（A） takes effect （B） takes part （C） takes place （D） takes turns
18. The president made a ____ speech at the opening ceremony of the sports meeting， which encouraged the sportsmen greatly.
（A） vigorous （B） tedious （C） flat （D） harsh
19. It is useful to be able to predict the extent _____ which a price change will affect supply and demand.
（A） from （B） with （C） to （D） for
20. Finding a job in such a big company has always been _____ his wildest dreams.
（A） under （B） over （C） above （D） beyond