一、单项选择（共15小题，每小题1分，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。
( ▲ ) 1.一 How long does it take you to go to school from your home?
一It takes me half ▲ hour by ▲ bicycle．
A．／；the B．an；a C．an；／ D．／；a
( ▲ ) 2.The terrible accident happened ▲ a cold morning in the spring of 2014.．
A．in B．for C．by D．on
