A.To cancel a visit. | B.To make an appointment. | C.To give some information. |
A.To apply for a new job. | B.To make an apology. | C.To make an appointment. |
For first-degree burns, first, place burns under cool running water, especially within the first ten minutes. Second, dry the burnt area
1. Where does the conversation take place?
A.In a waiting room. | B.In the doctor’s office. | C.Over the phone. |
A.He has a stomachache. | B.He has a toothache. | C.He has a headache. |
A.Right now. | B.This afternoon. | C.Tomorrow |
A.To visit his friend. | B.To take a medical test. | C.To look after his mother. |
6 . A new breakthrough in material science could revolutionize medical implants. Scientists at Southeast University in China have developed a piezoelectric material that is not only highly effective but also biodegradable. This innovation surpasses previous biodegradable options by a factor of 13 in terms of piezoelectric performance.
Piezoelectric materials have the unique ability to convert mechanical energy into electrical energy. This property makes them ideal for various medical implants, like pacemakers and drug delivery devices. However, traditional options lack biodegradability, necessitating a second surgery for removal after serving their purpose. This additional procedure can be expensive and carries inherent surgical risks.
The newly developed material, the discovery of which was led by Zhang Hanyue and Professor Xiong Rengen, is a kind of ferroelectric molecular crystal. The crystal offers the remarkable combination of both piezoelectricity and biodegradability. Notably, the material boasts a piezoelectric coefficient (d33) of approximately 138 picocoulombs per newton, a significant 13-fold increase compared to previous biodegradable materials.
Furthermore, the material is conveniently combined with polyvinyl alcohol (PVA), granting it high flexibility and biocompatibility within the body. This translates to safe implantation that can eventually dissolve naturally, eliminating the need for removal surgery.
The researchers envision this innovative material being utilized in a diverse range of next-generation medical implants. This research, published in the March 29 issue of Science magazine, represents a significant leap forward in the field of medical implants. Media outlets in China called the discovery a landmark breakthrough since the discovery of the piezoelectric effect by the Curie brothers in 1880.
1. What makes piezoelectric materials suitable for medical implants?A.Their ability to convert electrical energy into mechanical energy. |
B.Their biodegradability after serving their purpose. |
C.Their unique ability to convert mechanical energy into electrical energy. |
D.Their low cost and ease of availability. |
A.increases the piezoelectric coefficient by 13 times |
B.is only suitable for pacemakers |
C.requires a second surgery for removal |
D.lacks flexibility and biocompatibility |
A.improve its piezoelectric performance |
B.make it biodegradable |
C.enhance its flexibility and biocompatibility |
D.reduce its cost of production |
A.It was the first piezoelectric material to be developed |
B.It surpasses previous biodegradable options significantly |
C.It was discovered by Chinese scientists |
D.It has been mentioned in Science magazine |
7 . When colds and flu hit, many people automatically turn to over-the-counter (OTC) medicines to push through and treat their symptoms. Although these medicines are easily accessible and widely used, it might come as a surprise to many people to learn that they are not risk-free. A study estimated that every year, 26,735 people went to the emergency room for adverse (不利的) events related to OTC cold and cough medicines.
When two or more drugs are used together, their interactions can sometimes produce unexpected harmful effects. Physicians are typically knowledgeable about potential drug interactions, so it is very important for patients to ask their healthcare providers which OTC medicines are safe for them to use.
It is important to read the package ingredients of OTC medicines closely to avoid duplication of doses (剂量重复). Cold medicines are typically made up of multiple ingredients. A person who takes a single-ingredient medicine paired with one of these multi-ingredient medicines can receive an unsafe dose of that ingredient.
While everyone could potentially experience adverse effects from cold and flu medicines, some groups — including older adults, children and pregnant women — may be at greater risk. Older people who are using prescribed drugs to treat multiple health conditions may have a higher risk of drug interactions because of the higher number of medicines being used at the same time to treat different conditions. The aging body is not as expert at absorbing, distributing and clearing medicines as younger bodies are. This can put older adults at higher risk for an overdose and drug-to-drug interactions with some medicines.
The Food and Drug Administration and the Centers for Disease Control and Prevention do not recommend giving cold medicines to children under age 4. Because of a variety of factors, young children have a higher risk of an accidental overdose and adverse events that could lead to death.
1. What does the author advise patients to do in Paragraph 2?A.To ask for suggestions from doctors. | B.To buy medicines from hospitals. |
C.To read the package ingredients of drugs. | D.To take drugs as early as possible. |
A.To provide a medical choice for people who catch a cold. |
B.To show cold medicines are more likely to cause bad effects. |
C.To explain OTC medicines often have more than one ingredient. |
D.To stress the importance of learning about medicines’ ingredients. |
A.They can’t cope with aging positively. | B.Their body can’t handle medicines easily. |
C.They are more easily affected by diseases. | D.Their desire for health makes them unwise. |
A.Say No to OTC Drugs | B.Tips on Taking OTC Drugs |
C.OTC Medicines May Not Be Safe | D.How to Deal with an OTC Drug Overdose |
1. What is the matter with Mr. Smith?
A.He is unqualified for his job. | B.His leg is broken. | C.He got a sore throat. |
A.Chinese. | B.English. | C.Physics. |
A.He has to help his students prepare for the exam. |
B.He has trouble sleeping. |
C.He wants to visit a friend. |
A.Work at his office. | B.Attend a basketball game. | C.Take the girl to see a doctor. |
A.Last week. | B.One month ago. | C.Six months ago. |