大学英语四级考试模拟题一
Part Ⅰ Writing （30 minutes）
Directions：For this part, you are allowed 30 minutes to write a short essay on the topic: ONE –OFF CHOPSTICKS. You should write at least 120 words following the outline given below in Chinese：
1. 你和你的朋友在餐厅就餐，你的朋友对餐厅提供的非一次性筷子不满。
2. 餐厅的负责人解释说这是为了节约资源，并保证这些餐具已经严格消毒；
3. 你对此事的看法和采取的做法。
One-off Chopsticks
注意：此部分试题在答题卡1上。
Part Ⅱ Reading Comprehension （Skimming and Scanning）（15 minutes）
Directions：In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A,B, C and D. For questions 8-10, complete the sentences with the information given in the passage.
注意：此部分试题请在答题卡1上作答；8-10题在答题卡1上。
Plastic Bag Pollution
The use of plastic bags has increased at an alarming rate since they became popular in the 1980s. Big black bin liners, plastic carrier bags carrying advertising logos, clear sandwich bags and a variety of other forms. They‟re lightweight, handy and easily discarded. Too easily discarded. Just take a look around you. Plastic bags can be seen hanging from the branches, flying in the air, settled amongst bushes, and floating on rivers. They block up drains causing water and sewage to overflow and become the breeding grounds of bacteria that cause diseases.
Plastic bags are difficult and costly to recycle and most end up on landfill sites where they take around 300 years to decay. They break down into tiny toxic particles that pollute the soil and waterways and enter the food chain when animals accidentally consume them. But the problems surrounding waste plastic bags start long before they decay. Our planet is becoming increasingly endangered by our over-use of plastic bags.
Production of Plastic Bags
Plastic bags are made from ethylene (乙烯)，a gas that is produced as a by-product of oil, gas and coal production. Ethylene is made into polymers (聚合体)—chains of ethylene molecules—called polyethylene. This substance, also known as polythene, is used to produce a range of items, including plastic bags.
Y ou have probably noticed two types of plastic shopping bag s—the lighter, filmy bags you get from supermarkets and food outlets, and the heavier bags from other retail outlets, like clothing stores. The supermarket bags are made from high density polyethylene (HDPE), while the thicker bags are made from low density polyethylene (LDPE). Unlike HDPE, LDPE can not be recycled. While plastic bags may not be the most high tech application of plastics technology, it is certainly one of the most prevalent. According to Clean Up Australia, Australians use in excess of 6 billion plastic bags per year. If tied together these bags would form a chain that is long enough to go around the world 37 times. More than half of these bags (3.6 billion) are made from
