A、
At the beginning of the 17th century.
B、
At the end of the 20th century.
C、
At the end of the 17th century.
D、
At the beginning of the 20th century.
【正确答案】
D
【答案解析】
A、
Because it takes much time, and it increases the cost of the product or service.
B、
Because the cost of materials is high.
C、
Because the salaries of the salesclerks are high.
D、
Because advertisements cost a lot.
【正确答案】
A
【答案解析】
A、
In 1287.
B、
In 1278.
C、
In 1827.
D、
In 1872.
【正确答案】
B
【答案解析】
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