Steven Stein likes to follow garbage trucks.His strange habit makes sense when you consider that he's（11）_____environmental scientist who studies how to reduce garbage， including things that fall off garbage trucks as they drive down the road.What is even（12）_____（interest）is that one of Stein's jobs is defending an industry behind the plastic shopping bag.

Americans use more than 100 billion thin plastic bags every year.So many end up in tree branches or along highways that a（13）_____（grow）number of cities do not allow them at checkouts.The bags（14）_____（prohibit）in some 90 cities in California， including Los Angeles.Eyeing these headwinds， plastic-bag makers are hiring scientists（15）_____ Stein to make the case that their products are not as bad for the planet as most people assume.

Among the bag（16）_____（make）arguments：many cities with bans still allow shoppers to purchase paper bags，（17）_____are easily recycled but require more energy to produce and transport.And while plastic bags may be ugly to look at， they represent a small percentage of all garbage on the ground today.

The industry（18）_____（take）aim at the product that has appeared as its replacement： reusable shopping bags.The stronger a（19）_____（reuse）bag is， the longer its life and the more plastic-bag use it cancels out.However， longer-lasting reusable bags often require more energy to make.One study found that a cotton bag must be used at least 131 times to be better for the planet than plastic.

Environmentalists don't dispute these points.They hope paper bags will be banned someday（20）_____want shoppers to use the same reusable bags for years.

11.an【解析】空后environmental scientist是可數(shù)名詞，且此處泛指他是一位環(huán)境科學(xué)家，故填不定冠詞an。

12.more interesting【解析】根據(jù)空前的even判斷此處應(yīng)填interest的形容詞形式，且even修飾比較級，意為“甚至更……”。句意：更有趣的是Stein工作內(nèi)容之一是保衛(wèi)一個支持塑料購物袋的行業(yè)。

13.growing【解析】根據(jù)空前的冠詞a及空后的名詞number可知，此處需用grow的形容詞形式。a growing number of意為“越來越多的”。

14.are prohibited【解析】空格所在句缺少謂語部分，the bags為復(fù)數(shù)形式且和謂語動詞為被動關(guān)系，故填are prohibited。

15.like【解析】分析上下文可知，此處句意為“塑料袋制造商雇用像Stein這樣的科學(xué)家以讓人們相信他們的產(chǎn)品對于這個星球不像大部人以為的那么有害”，故填like。

16.makers'【解析】句意：塑料袋_____的論據(jù)是：很多有塑料袋禁令的城市仍然允許購物者購買紙袋，紙袋容易回收，但需要更多的能源來生產(chǎn)和運輸。分析句意可知，此處應(yīng)填make的名詞形式“制造商”的所有格，且制造商不止一家，故填makers'。

17.which【解析】空格所在句為非限定定語從句，修飾逗號前的 paper bags，且在從句中充當(dāng)主語。故填which。

18.has taken【解析】句意：這個行業(yè)以已經(jīng)出現(xiàn)的替代品——可重復(fù)使用的購物袋為目標(biāo)。根據(jù)句意，這個行業(yè)已經(jīng)以此為目標(biāo)，需用完成時，且主語為第三人稱單數(shù)，故填has taken。

19.resuable【解析】根據(jù)空前的a及空后的bag判定，此處填reuse的形容詞形式，根據(jù)復(fù)現(xiàn)原則，前后文多次出現(xiàn)reusable，故填reusable。

20.and【解析】此空連接兩個并列句子，故填and。

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