读下图回答：

1、某班学生计划分成四个登山活动小组，目标是图中等高线所示的山峰，沿图中的甲乙丙丁虚线方向进行攀登。其中一组想沿坡度较陡的山谷攀登，其路线是 [ ]

A、甲

B、乙

C、丙

D、丁

2、此等高线地形图的等高距是[ ]

A、100米

B、200米

C、300米

D、400米

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.

6（）

A.then

B.really

C.only

D.indeed