Question

Timmy goes to school ________ every day．It's 5 minutes'walk from his home to school．

1. A.
   in a bus
2. B.
   by plane
3. C.
   on foot
4. D.
   by boat

Answer 1

C
解析：
表示方式或乘坐交通工具的介詞短語有：by bus, by train, by air/plane, on foot，一般名詞前不用冠詞，可以排除選項A；
另外，by plane(乘飛機)一般不會每天上學用到；
by boat“乘船”，也少見；
on foot(步行)每天去上學，比較合乎常理．