Did you ever have someone’s name on the tip of your tongue and yet you were unable to recall it (1) this happens again, do no (2) to recall it. Do something (3) for a couple of minutes, (4) the name may come into your head. The name is there since you have met (5) person and his name. It (6) has to be dug out. The initial effort to recall (7) the mind for operation, but it is the subconscious (8) that go to work to dig up a (9) memory. Forcing yourself to recall (10) never helps because it doesn’t (11) your memory；it only tightens it. Students find the preparatory method help (12) examinations. They read over the questions (13) trying to answer any of them. (14) they answer first the ones (15) which they are most confident. Meanwhile, deeper mental activities in the subconscious mind are taking (16) ; work is being done on the (17) difficult questions. By the time the easier questions are answered, answers (18) the more difficult ones will usually begin to (19) into consciousness. It is often (20) a question of waiting for recall to come to the memory.
5（）
A.some
B.certain
C.a
D.this
参考答案：D
解析：
[考点] 逻辑推理
本题要求考生根据空格的上下文来进行逻辑推理。空格前提到名字在那里，即你的大脑里，因为你已经碰到过并知道他的名字，那么可以推断出你碰到过的正是这个人，可确定this符合句意，意为“既然你曾碰到过此人”。
[干扰项分析] A选项some表示“一些”；B选项certain、C选项a表示未曾见面的不确定的某个人，而本空格前have met：的时态暗示你已与此人谋面，故这三个均不是正确选项。