[答案]A. process.

　　[注释]process(=connected series of actions, or series of operations) 过程：By what process is cloth made form wool?(经过什么过程羊毛织成呢料?)practice(=the doing of something of, performance or repeated exercise, etc.)实习，练习;开业: She is doing her practice at the piano.(她在练习弹钢琴。)procedure(=the regular order of doing things)程序：the usual procedure at a meeting(开会的通常程序)。Program(=plan of what is to be done or list of items or events)课程，计划，大纲：What is the program for tomorrow ?(明天上什么课?)

　　[答案]A. Incidentally.

　　[注释]incidentally(=by the way)附带地，顺便：Fred said, incidentally, that he had no dinner.(顺便提一下，福来德那时说，他还没吃晚饭。)accidentally(=by chance)偶然地： I met with an old friend of mine accidentally last week.(上星期我偶然碰到一位老朋友。)occasionally (=from time to time, not regularly) 不时地， 偶尔：We get visitors here occasionally.( 我们偶尔在此接游客。)subsequently(=afterwards, later) At first we thought we would go; but subsequently we learned we were needed at home.(起初,我们想离开;但随后我们得知家里需要我们。)

　　[答案]C. arise.

　　[注释]arise(=come into being, appear, happen)产生，发生：Difficulties will arise as we do the work.(我们做这项工作时将会发生困难。)

　　arouse 唤起，激起，唤醒;rise 上升;abide (by)遵守。本题译文：当中学毕业年龄上升到16 岁时，很可能产生完全新的情况。

　　[答案]A. diagnosed.

　　[注释]diagnose...as 把......诊断为......。本题译文：玛丽的病现已诊断为肝炎。

　　[答案]D. fluctuations.

　　[注释]fluctuations 波动;waves 波浪;alterations(部分)改变，变更;vibrations(物理学上)振动。