Plasticbagshaven’talwaysbeenPublicEnemyNo.1.Introducedi...

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問題詳情：

Plastic bags haven’t always been Public Enemy No. 1 . Introduced in 1982, they soon occupied the grocery bag marker. By 1996, 80 percent of all bags were made from lightweight plastics. Customers loved them. They became thinner, lighter and able to contain more materials conveniently.

That restricting the distribution of plastic bags will have significant environmental benefits and reduce cost is mostly untrue. Banning plastic bags won’t bags are found to be a tiny part of all litter, so banning them has very little impact on the amount of litter generated. There’s no evidence that banning plastic bags has reduced litter removal costs, and it won’t do much in the way of reducing trash collection costs, either.

In the sea, the impact may be even smaller. Plastic bags have not caused a giant landfill(廢棄物填埋場). Sure, plastics in the oceans have increased over the past four decades. Yet the idea that this has resulted in a big landfill at is contradicted by the evidence, which shows that most plastics in the oceans are widely dispersed(分散)and in the form of tiny pieces.

Surveys suggest that most people reuse their lightweight plastic bags, mainly for trash disposal, and on average each one is used 1.6 times, By contrast, paper bags are typically used only once. The thicker plastic bags now being promoted as “ reusable”, are typically used about 3.1 times.

It is unwise to introduce restrictions on the distribution of plastic bags, which is likely to result in an increase in the overall environmental impact of the bags we use to shop, not to mention that reusable bags are kind of disgusting, from the public health perspective. Putting food into bags that have previously been used to carry perishable(易腐爛的) items may cause a health risk.

29. The reason why plastic bags are popular with customers is that .

A. they are easy to carry

B. they are the only choice.

C. they are cheap and affordable

D. they are available in groceries.

30. Why does the author say banning plastic bags makes no difference to the quantity of litter?

A. Because plastic bags take up a small part of the whole litter.

B. Because banning plastic bags has increased litter removal costs.

C. Because the banning plastic bags won’t necessarily make litter disappear.

D. Because the banning of plastic bags hasn’t any environmental benefits.

31. The underlined part in Paragraph 3 implies that.

A. most of the plastics can be well recycled at sea