单选题 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 not 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 learned his name. It 6 has to be dug out. The initial effort to recall 7 the mind for operation, but it is the subconscious (下意识的) 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 helpful 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 question. 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.