Several large companies have begun creating paper bottles to replace glass and plastic ones.

A company called Paboco has been working with many large companies to develop paper bottles. These companies are creating their own bottle designs.

Clearly, one of the biggest challenges is keeping a paper bottle from leaking (渗漏). The inside of the bottle needs a special liner (衬层) to make sure the liquid doesn’t leak through. Many companies are lining their bottles with thin plastic.

Though bottle makers may say this liner can be removed and recycled, many recycling programs don’t have the right machines to deal with these liners.

A Danish beer company called Carlsberg is working with Paboco on a paper bottle called the “Green Fiber Bottle”. Now the bottle uses a plastic liner. In the future the company hopes to use a “bio-plastic (生物塑料)” that will break down naturally over time.

But even without the plastic, paper bottles aren’t perfect. Most paper bottles use wood pulp (木浆). That could lead to the loss of forests.

Frugalpac, a company from the United Kingdom, has created bottles made of recycled paper, so no trees need to be cut down. Frugalpac still uses plastic liners, though.

But with so many companies working towards the same goal, we will see more paper bottles on store shelves in the near future.

根据短文内容，选择最佳选项。

1. One of the biggest challenges of using paper bottles is _________.

A．	how to use few liners
B．	how to make perfect liners
C．	keeping the plastic bottles from breaking down
D．	keeping the paper bottles from leaking

2. What does the underlined word “Frugalpac” refer to?

A．	A Danish milk company.
B．	A Danish beer company.
C．	A company from the United States of America.
D．	A company from the United Kingdom.

3. Which of the following is TRUE according to the passage?

A．	A company called Paboco has been working to develop paper bottles alone.
B．	Many paper bottles have thin plastic inside.
C．	It’s impossible to remove and recycle the liners of paper bottles.
D．	The loss of forests leads to the use of wood pulp in most paper bottles.

4. What’s the main idea of this passage?

A．	Paper bottles are not perfect.
B．	Bottles are made of recycled paper.
C．	Some companies work to develop paper bottles.
D．	Some companies work to develop glass and plastic bottles.