单项选择题知识覆盖面广，灵活性大，综合性强，且每题所提供的选择项迷惑性较大。因此，要做好单项选择题，除了具备扎实的基本功以外，还要了解一些解题技巧。在这里要特别提醒同学们切莫忽视语境，所谓“语境”，也就是我们常说的上下文关系。在答题的过程中，我们要紧扣语境来做选择题。
【例题】
1. Please turn ______ the radio a little. The baby is sleeping.
A. to B. down C. on D. up
【解析】该题因为有了The baby is sleeping.这一特定的语境，所以正确答案应该是B。
【例题】
2. —You are not a new member, are you?
�_________. I joined only yesterday.
A. No, I”m not B. Yes, I”m not C. No, I am D. Yes, I am
【解析】此题可先排除B和C两项，因为按照英语习惯，yes后面应接肯定答语，no后面应接否定答语。那么，正确答案是A还是D呢？如果不是I joined only yesterday.这一语境的限制，从语法上讲A和D都正确。但正因为有了这个特定语境，所以正确答案只能是D。
下面我们就来练习一下吧！请选择最佳答案。
1. There are _____ people in the park because it is raining heavily.
A. little B. a little C. few D. a few
2. �What are you doing?
�I”m looking _______ the children. They should be back for lunch.
A. after B. at C. for D. up
3. I ______ you ________ in London. How long have you been here?
A. don”t know; were B. hadn”t known; are
C. haven”t known; are D. didn”t know; are
4. I planned to get to Shanghai on Wednesday, but I didn”t arrive ______ Friday.
A. on B. in C. until D. at
5. �Which of the two books do you want?
�________.
A. Both are right B. Either will do C. Any will do D. None
Key：1~5CCDCB