问题1选项
A.A new concept of diabetes.
B.The definition of Type 1 and Type 2 diabetes.
C.The new management of diabetics in the hospital.
D.The new development of non-perishable insulin pills.
问题2选项
A.Because it vaporizes easily.
B.Because it becomes overactive easily.
C.Because it is usually in injection form.
D.Because it is not stable above 40 degrees Fahrenheit.
问题3选项
A.The diabetics can be cured without taking synthetic insulin any longer.
B.The findings provide insight into how insulin works.
C.Insulin can be more stable than it is now.
D.Insulin can be produced naturally.
问题4选项
A.It is stable at room temperature for several years.
B.It is administered directly into the bloodstream.
C.It delivers glucose from blood to the cells.
D.It is more chemically complex.
问题5选项
A.Why insulin is not stable at room temperature.
B.How important it is to understand the chemical bonds of insulin.
C.Why people with Type1 and Type 2 diabetes don’t produce enough insulin.
D.What shape insulin takes when it unlocks the cells to take sugar form blood.
21. What is the main idea of the talk? 【解析】文章开头即给出了主旨：一组澳大利亚的化学系学生强化了胰岛素的化学键，以使其在高温下也能稳定。故选D。
第2题:
22. Why does insulin need to be kept cold, according to the talk? 【解析】根据文章信息，胰岛素的化学结构较弱，在高温下会使胰岛素失效。故选D。
第3题:
23. What makes the research more promising? 【解析】根据原文信息可以得知：研究结果更有助于了解胰岛素是如何发挥效用的，故选B。
第4题:
24. What is true about the new type of insulin? 【解析】根据原文信息可以得知：这种新型胰岛素可以在室温下放置几年（不变质），故选A。
第5题:
25. What is unknown to the scientists, according to the talk? 【解析】原文中提到当胰岛素“打开”细胞，让血液中的葡萄糖进入细胞时，荷尔蒙的形态随之改变，但无人知晓其形态是什么样的。故选D。
原文：
(21) A team of Australian chemistry students have strengthened the chemical bonds of insulin to make it stable even at warm temperatures—a breakthrough that could simplify diabetes management. The finding could shed light on how insulin works and eventually lead to insulin pills, rather than injections or pumps. (22) Insulin needs to be kept cold because it is made of weak chemical bonds that degrade at temperatures above 40 degrees Fahrenheit, making it inactive. But using a series of chemical reactions, the research team, comprised of students from Monash University in Australia, replaced the unstable bonds with stronger, carbon-based ones. The stronger bonds stabilize the insulin’s two protein chains without interfering with its natural activity, according to a story about the findings at SciGuru. (24) The so-called “dicarba” insulins were stable at room temperature for several years, SciGuru says. (23) Even more promising is that the findings provide insight into how insulin works. People with Type 1 and Type 2 diabetes do not produce enough insulin, whether it’s the result of an auto-immune disorder that stops producing it entirely (Type 1) or a condition brought on by other factors like obesity, in which the body can no longer use it properly (Type 2). Insulin is the mechanism that delivers glucose from the blood to the cells, so diabetics must take a synthetic form of the hormone. (25) When insulin unlocks cells to allow sugar to be taken up from the blood, the hormone’s shape changes—but no one is sure what the shape looks like. If researchers knew that shape, they could design smaller; less-complex versions of insulin that don’t use proteins. Then it could be administered in pill form rather than directly into the bloodstream. Understanding the molecule’s chemical bonds is a step toward unlocking that shape, the researchers say.
