选修
8
不怕鬼的故事Unit 3
思天下
高考试卷分块专练
练 一
语言知识运用保分练
菊花的花语和寓意
1篇完形＋
1篇语法填空，限时
25分钟幸福的成语
Ⅰ .完形填空
员工考核表Realable (可密封的兔子养殖技术大全 ) plastic bags — sometimes called by a brand name, such as Ziploc 晾臀? — are tho little clear plastic bags you u to keep your sandwiches and chips fresh. They usually have some sort of aling mechanism, like a plastic zipper, which allows you to al 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 the organisms __5__ getting to your food.
Realable plastic bags can be ud for more than just __6__ sandwiches, chips and snacks to school for lunch. They're also ud to
keep leftovers __7__ in the refrigerator. Many people also u them to __8__ food in the freezer for u in the future.
The __9__ of the realable 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 Madn. The zippers were __12__ ud as parts of binders and briefcas.
Over time, __13__ ， plastic zipper bags were developed. Eventually, in 1968, Dow Chemical Company __14__ to market its Ziploc ? brand of realable plastic bags to grocery stores. They turned out to be very __15__.
Today, the 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 u __19__ plastic becau of its effect on the environment. So manufacturers of realable 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，
少年维特之烦恼
为了减少污染， 这类
