四．单项填空（共15小题，计15分）
从 A,B,C,D 四个选项中，选出可以填入空白处的最佳选项。
( )16. The underlined part in the word “head is pronounced as ______.
A. / æ/ B./ iə / C./ e / D./ ei /
( )17—________ does the train come in your city?
__ Every two hours.
A.How long B.How often C. How far D. How many
( )18.My grandfather plays Taiji in the park every morning________ .
A. for keep healthy B. to keep fit C. to exercise D. for a good habit
