二、选择填空（共25小题；每小题1分，满分25分）
A)单项填空（共15小题；每小题1分，满分1 5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，并在答题卡上将该项涂黑。
16. Hiking is _______great fun. You will get close to _______nature and take exercise at the same time.
A. a; the B. a;／. C./; the D.／;／
17. Today it's becoming more and more important for students to learn to teach _______.
A. himself B. themselves C. him D. them
