Lesson 50
注解
�。�1）chicago 芝加哥
（2）los angeles 洛杉磯
�。�3）philadelphia 費(fèi)城
�。�4）nation n. 國家
（5）washington d. c. 華盛頓特區(qū)
then ask these questions:
（1）which city has the largest population in the united states?
�。�2）what do you think the large population can bring to us?
vi. language focus
get the students to know how to use the following word and expressions.
1. room: i’m afraid, there is no room ( space ) for us on the bus.
this big bag takes up too much room.
let me make room for our teacher.
2. hour after hour: the clock goes on striking hour after hour.
peter stayed in bed day after day.
year after year went by, she still didn't receive her son's news.
vii. workbook
do exercises 2 and 3 individually, then check the answers with the whole class.
the answers to exercise 2: about, not, multiply by. hour after hour, fast, developing, problem, developed, slow down.
the answers to exercise 3: 1. hardly 2. at the beginning of 3. path 4. worth 5. beg your pardon