单词拼写：

1. I have good reading ___________(理解), so I can understand it.

2. You should give clear ______________(说明) for all the exercises.

3. By the time the police arrived, the thief had ____________(消失).

4. In the United States, many _____________(青少年) begin to smoke.

5. Our English teacher likes ______________ (文学) very much.

光缆的埋深应符合标准要求，最浅不得小于标准的（），否则对光缆应采取下落或保护措施。

A.1/2

B.2/3

C.3/4

D.4/5