选修8 Unit 3 高考试卷分块专练 Ⅰ.完形填空 Resealable (可密封的) plastic bags — sometimes called by a brand name, such as Ziploc? — are those little clear plastic bags you use to keep your sandwiches and chips fresh. They usually have some sort of sealing mechanism, like a plastic zipper, which allows you to seal the bag to keep __1__ out. Keeping air away from __2__ allows them to stay fresh longer. Bacteria and other organisms in the air will __3__ food items over time if allowed to come into __4__ with them. Sealed plastic bags keep these organisms __5__ getting to your food. Resealable plastic bags can be used for more than just __6__ sandwiches, chips and snacks to school for lunch. They're also used to keep leftovers __7__ in the refrigerator. Many people also use them to __8__ food in the freezer for use in the future. The __9__ of the resealable plastic bag started out in 1951 at a company named Flexigrip, Inc. Flexigrip __10__ a plastic zipper from patents which was bought from __11__ Borge Madsen. These zippers were __12__ used as parts of binders and briefcases. Over time, __13__， plastic zipper bags were developed. Eventually, in 1968, Dow Chemical Company __14__ to market its Ziploc? brand of resealable plastic bags to grocery stores. They turned out to be very __15__. Today, these types of bags are __16__ in many different sizes and styles, from snack and sandwich bags to craft and freezer bags. You can also buy bags with expandable bottoms that __17__ on their own. Some bags even allow you to __18__ food in the microwave! However, now many people try to use __19__ plastic because of its effect on the environment. So manufacturers of resealable plastic bags have taken __20__ to become more environmentally friendly. 语篇解读：本文主要介绍了可密封塑料袋的用途及发展史。同时指出，为了减少污染，这种塑料袋的生产厂家也采取措施以使他们的产品更加环保。 1．A.air B．water C．dust D．fog 解析：选A 由第二段开头的“Keeping air away”可知，此处指把空气阻挡在外面。 2．A.plants B．containers C．bags D．foods 解析：选D 根据下文中的“Bacteria and other organisms in the air will __3__ food items over time”可知，此处指让空气和食物隔离，以便食物保鲜的时间长些，故选foods。 3．A.bring in B．take out C．break down D．deal with 解析：选C 空气中细菌和其他微生物会分解食物导致食物变质。break down意为“分解”。 4．A.relation B．contact C．connection D．contract 解析：选B 如果细菌和其他微生物与食物接触，食物将会很快变质。contact意为“接触”；relation意为“关系”；connection意为“连接”；contract意为“合同”。 5．A.from B．against C．through D．beyond 解析：选A keep ... from ...为固定搭配，意为“阻止……”。 6．A.following B．presenting C．supplying D．transporting 解析：选D 下文中的“to school for lunch”说明，此处指携带食物到学校。 7．A.wet B．fresh C．thin D．hard 解析：选B 根据句中的“in the refrigerator”及生活常识可知，它们也被用来保持剩余的食物新鲜。 8．A.store B．cook C．share D．produce 解析：选A 本段主要介绍可密封塑料袋能用来 ... ...
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