答案：B　推理判断题。从文章第二、三段大意可知，本文主要介绍两种水下自我探测器。故选B。

　　Ⅱ.语法填空

　　阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

　　(2015·青岛市二模)

　　It's never foolish __1__(acknowledge) you are in the wrong. Being human, we all need the art of apology. Look back and think how often you've judged __2__(rough), said unkind things, pushed yourself ahead __3__ the cost of a friend. Some deep thought lets us know that when even a small mistake has been made, your feeling will stay out of balance __4__ the mistake is acknowledged and your regret is expressed.

　　I remember a doctor friend __5__(tell) me about a man who came to him with __6__(vary) illnesses: headache, insomnia, stomachaches and so on. No physical cause could __7__(find). Finally the doctor said to the man, “Unless you tell me what's on your conscience, I can't help you.”

　　After __8__ short silence, the man told the doctor that he seized all the money that his father gave to his brother, who was abroad. His father was __9__(die), so only he himself knew the matter. The doctor made the man write to his brother making an apology and enclosing a check. In the post office, the man dropped the letter into the mail box. As the letter __10__(disappear), the man burst into tears. “Thank you, doctor，” he said, “I think I'm all right now.” And he was.

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