重点词汇
1. 重点词语搭配
be satisfied with “对…(感到)满意” make a promise “许诺”
all the time “始终；一直” keep a promise “坚守许诺”
at a time “一次；每次” break a promise “违背许诺”
2. discover/invent
discover “发现” 指初次看见本来已存在但以前未被发现的事物
invent “发明” 指创造前所未有的事物
【小试牛刀】
1. Columbus_____________ America but he did not explore the new continent．
2. Edison______________ the electric light bulb．