L5：1、电商的成本有电费，服务人员的工资，推销的费用。吸引消费者的方法有打折，或把物品拆分低价零售。
2、包子，成本需要肉和面粉的钱，运费，加工费，包装费。
英文文章：The definite article the is the most frequent word in English.
We use the definite article in front of a noun when we believe the hearer/reader knows exactly what we are referring to.
• because there is only one:
The Pope is visiting Russia.
The moon is very bright tonight.
The Shah of Iran was deposed in 1979.
This is why we use the definite article with a superlative adjective:
He is the tallest boy in the class.
It is the oldest building in the town.
重点：The definite article the is the most frequent word in English.
重点单词：frequentword The definite article
地址：http://learnenglish.britishcouncil.org/en/english-grammar/determiners-and-quantifiers/definite-article
L6：1、
2、英文文章：
What is a 'Business Model'
A business model is a company's plan for how it will generate revenues and make a profit. It explains what products or services the business plans to manufacture and market, and how it plans to do so, including what expenses it will incur.
BREAKING DOWN 'Business Model'
A business model lays out a step-by-step plan of action for profitably operating the business in a specific marketplace. The business model for a restaurant is significantly different from the business model for an online business for instance.
To put together a good business model, you need to know the value proposition for the business. A value proposition is a straightforward statement of what a company offers in the form of goods or services that is of value to potential customers or clients, ideally in a way that differentiates the company from its competitors.
A business model should also include projected startup costs and sources of financing, the target customer base for the business, marketing strategy, competition, and projections of revenues and expenses. One of the most common mistakes leading to the failure of business startups is a failure to project the necessary expenses to fund the business to the point of profitability, i.e., the point in time when revenues exceed expenses.
If possible, a business model should include any possible plans for partnering with other existing businesses. An example of this would be an advertising business that aims to establish an arrangement for referrals to and from a printing company.
重点内容：A business model is a company's plan for how it will generate revenues and make a profit. It explains what products or services the business plans to manufacture and market, and how it plans to do so, including what expenses it will incur.
重点单词：generate、company's plan、manufacture。
地址：http://www.investopedia.com/terms/b/businessmodel.asp
