词汇讲解：
1. random adj. 胡乱的;随便的,任意的; 随机的
例句：He was not listening and made a random answer to the teacher's question.
他不在听讲,对教师的问题瞎答一通。
2. memo n. 备忘录
例句：I made a memo on my memo-pad to buy more coffee.
我在记事簿上记下了要再买些咖啡。
3. alarm n. 警钟, 警报器, 闹钟
例句：He is afraid of waking up late, so he always has an alarm on his bedside table.
他怕睡过头，总是在床头小几上放一个闹钟。
4. categorize vt.把…归类;把…列作
例句：Categorize the plants into four groups.
把这些植物分成4类。
5. option n. 选择;选择权;选择自由
例句：She had no option but to quit her job in order to take care of her child.
为了照顾孩子,她别无选择,只好辞职。
6. scatter vt. 撒
例句：The farmers were scattering seeds on the fields.
农夫把种子撒在田里。
7. dial v. 打电话, 拨电话号码
例句：Do you often dial home?
你常给家里打电话吗?
8. proficiency n. 熟练, 精通
例句：His proficiency as a surgeon is well known.
他作为一名外科医生的水平是有名的。
9. replace vt. 取代;以...代替
例句：Electric lights have replaced candles.
电灯已经取代了蜡烛。
10. must n. 必须做的事, 必不可少的事物
例句：Warm clothes are a must in the mountains.
到山区去穿暖和的衣服是必须的。
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