Nanotechnology and its applications

文章大意

这篇雅思听力Part4讲座介绍纳米技术及其应用。纳米技术是在原子和分子层面操控物质，尺度约1到100纳米。1959年物理学家费曼提出设想，1981年特殊显微镜发明后现代纳米技术真正开始。讲座提到纳米产品可能对环境、健康和安全（EHS）构成威胁，需要风险评估和国际合作。应用方面包括食品加工中改善铁缺乏、包装中的纳米材料、增强食品风味，以及智能家具和可持续农业。

题目与答案

1. About Nanotechnology

   ·It is a study on t he scale of nanometre

   ·The development in nanotechnology is the result of a new type of 31_____ .

   答案：microscope

   原文定位：In fact, it wasn't until nineteen eighty-one, with the invention of a special kind of microscope, that modern nanotechnology truly began

   同义替换：「development」↔「truly began」，「new type of」↔「special kind of」，「result of」↔「with the invention of」

2. ·People are worried that nanotech products are 32_____ .

   答案：unnatural

   原文定位：Even though nanotechnology has created many new materials and devices with a vast range of applications, there is always concern over these unnatural products

   同义替换：「worried」↔「concern」

3. Food and household

   ·The availability of 33_____ in our diet (e.g. in potatoes) is great improved.

   答案：iron

   原文定位：In the food processing industry, nanotechnology is leveraged against iron deficiency;improves the bioavailability of this nutritional ingredient

4. ·The packaging cost of 34_____ is particularly reduced.

   答案：chocolate

   原文定位：In terms of packaging, nanomaterials are more economical and are used in all sorts of products, chocolate in particular

   同义替换：「packaging cost reduced」↔「more economical」

5. ·Nanotechnology can increase the 35_____ of food.

   ·Nanotechnology can be used to make new types of furniture.

   答案：flavor|flavour

   原文定位：Nanotechnology can also enhance the flavor of food

   同义替换：「increase」↔「enhance」

6. Agriculture

   ·The efficiency of 36_____ is increased.

   答案：fertilizers

   原文定位：It offers great potential to strengthen the effect of fertilizers, thereby minimizing the environmental impact and boosting the productivity of plants in the soil

   同义替换：「increased」↔「strengthen」

7. Health and Medicine

   ·Nanotubes allow more 37_____ to enter veins.

   答案：drugs

   原文定位：Such nanotubes have become increasingly attractive to researchers because of their ability to efficiently deliver drugs into veins

   同义替换：「enter」↔「deliver」，「more」↔「efficiently」

8. ·As the most popular material, 38_____ is used to kill bacteria.

   答案：silver

   原文定位：It is mainly comprised of silver. Such nanoparticles can eventually kill some microbes due to the antiseptic properties

   同义替换：「most popular」↔「widely accepted」，「bacteria」↔「microbes」

9. ·Nanotechnology is also helpful in 39_____ loss program.

   答案：weight

   原文定位：Therefore, treatment programs are provided for patients to lose weight by disposing of excess fat in a relatively safer manner

   同义替换：「helpful」↔「treatment programs」

10. Cosmetic

    ·Nanoparticles protect skin from the 40_____ .

    ·an help to improve the ability against aging.

    ·Nanotechnology helps to deliver effective elements to the skin.

    答案：sun

    原文定位：Nanoparticles are commonly used as UV filters in anti-aging sun care products to avoid skin damage caused by the sun

    同义替换：「protect skin from」↔「skin damage caused by」