第一节： 单项填空（共15题，每小题1分，满分15分）
从A,B,C和D 四个选项中，选出填入空白处的最佳选项， 并在答题卡上将该项涂黑。
1. The moment you step on ______ board the ship to the USA, you must prepare yourself for ______ new environment you will face.
A. a; / B. a; the C. /; the D. the; the
2. Learning experiences happen to us throughout our lives, and not too lo ng ago, I had ______ that I would like to share.
A. it B. one C. that D. this
