1 . Cheating in sport is as old as sport itself. The athletes of ancient Greece used potions to strengthen themselves before a contest, and their modern counterparts have everything from anabolic steroids (类固醇) to growth hormones with which to_________their bodies. These days, however, such stimulants are_________, and those athletes must therefore face the challenges of anti-doping (反兴奋剂) agencies.

The agencies have had remarkable success. Testing for anabolic steroids was introduced in the 1970s, and the incidence of cheating seems to have_________dramatically as a result. The tests, however, are not entirely_________. And a study just published in the Journal of Clinical Endocrinology & Metabolism by Jenny Jakobsson Schulze and her colleagues at the Karolinska Institute in Sweden suggests that an individual’s genetic make-up could_________the tests in two different ways. One genotype, may allow athletes who use anabolic steroids to escape detection altogether. Another may actually be convicting (给……定罪) the innocent.

The test employed for testosterone (睾酮素) abuse usually relies on measuring the_________of two chemicals found in the urine (尿液): TG. and EG.. Any ratio above four of the former to the latter is considered_________and leads to more tests. However, the production of TG is controlled by a gene called UGT2B17. This gene comes in two varieties, one of which has a part missing and therefore does not work properly. A person may thus have none, one or two working copies of UGT2B17, since he inherits one copy from each parent. Dr. Schulze_________that different numbers of working copies would produce different test results. She therefore gave healthy male volunteers whose genes had been examined a single 360mg shot of testosterone — the standard dose for legal medical use — and checked their urine to see whether the shot could be_________.

The result was remarkable. Nearly half of the men who carried no functional copies of UGT2B17 would have gone undetected in the standard doping test.____________, 14% of those with two functional copies of the gene were over the detection threshold (门槛) before they had even received an injection. The researchers estimate this would give a ____________rate of 9% in a random population of young men.

Dr. Schulze also says there is substantial____________variation in UGT2B17 genotypes. Two-thirds of Asians have no functional copies of the gene which means they have a naturally____________ratio of TG to EG, compared with under a tenth of Caucasians (白种人) — something the anti-doping bodies may wish to take into account.

In the meantime, Dr. Schulz’s study does seem to offer innocents a way of____________themselves. Athletes who will travel to Paris for the Olympic games may be wise to travel armed not only with courage and the “spirit of Olympianism”, but also with a copy of their____________, just in case.

2 . The public must be able to understand the basics of science to make informed decisions. Perhaps the most dramatic example of the negative consequences of poor communication between scientists and the public is the issue of climate change, where a variety of factors has contributed to widespread mistrust and misunderstanding of scientists and their research. The issue of climate change also illustrates how the public acceptance and understanding of science (or the lack of it) can influence governmental decision-making with regard to regulation, science policy and research funding.

However, the importance of effective communication with a general audience is not limited to hot issues like climate change. It is also critical for issues such as the genetic basis for a particular behavior or the use of animal models because in these areas, the public understanding of science can also influence policy and funding decisions. Furthermore, with continuing scientific advances, more non-scientists will need to be able to analyze complex scientific information to make decisions that directly affect their quality of life.

Science journalism is the main channel for the popularization of scientific information among the public. Much has been written about how the relationship between scientists and the media can shape the efficient communication of scientific advances to the public. Good science journalists are specialists in making complex topics accessible to a general audience, while sticking to scientific accuracy. Unfortunately, pieces of science journalism can also oversimplify and generalize their subject material. As a result, the basic information conveyed is difficult to understand or obviously wrong.

Even though scientists play a part in conveying information to journalists and ultimately the public, too often the blame for ineffective communication is placed on the side of the journalists. I believe that, at least in part, the problem lies in places other than the interaction between scientists and members of the media. It exists because we underestimate how difficult it is for scientists to communicate effectively with a diversity of audiences, and most scientists do not receive formal training in science communication.

Eight months ago, Meng Hu, 27, quit her job as a flight attendant in Guangzhou, China. She is now working full-time as a live-streaming host on Taobao.

“I’ve been talking nonstop,” Hu said, laughing. “My throat gets really hoarse. You need to talk a lot, because your mood is contagious (有感染力的). Only when you talk     1     can you get your audience excited.”

Hu is part of a rising class of creators in China who are     2     to get in on live-stream shopping, an emerging form of retail that has grown into an industry worth an estimated $66 billion. Although the trend has been part of Chinese internet culture for years, analysts say the coronavirus pandemic has brought it mainstream.

Even the Chinese government has     3     its support, calling the industry the “new engine” of e-commerce growth and encouraging live-streaming as a solution to unemployment, which has risen     4     in China due to the pandemic.

Live-stream shopping is a combination of entertainment and e-commerce. Viewers buy goods online from people who show off their latest     5    --from lipstick to laundry detergent--in real-time videos. Many compare the concept to the TV shopping channel, but the Chinese model is     6     more modern, mobile and interactive. Hosts can give their fans discount coupons(优惠券) and flash     7     in real time, while viewers can click to send their favorite stars virtual “gifts.”

Part of the allure(吸引力) of     8     into this world is the prospect of a big payday. Brands routinely announce tens or hundreds of millions of dollars in sales in a single sitting. Top influencers can earn millions of dollars a year, according to Taobao. And even well-known business leaders are getting in on the act.

For people like Hu, the live-stream host in Guangzhou, the ongoing     9     presents both “a chance and a challenge.”

“Viewers might have doubled, but there’s probably about seven or eight times more new live-streamers now,” she estimated. “So many people like me have     10     live-streaming, and are selling products and doing the same thing.”

5 . There have been countless books and television series on living with teenagers, yet parents don’t seem to have _________ how to get their children to pick up their clothes from the bedroom floor, or even clean their room occasionally. It might be difficult to accept, but a new approach to dealing with rude or difficult teenagers is for parents to look at their own _________.

“The key to getting teenagers to respect you is to respect them first,” says Penny Palmano, who has written a best-selling book on teenagers. “You can’t _________ to treat them the same way that you have been treating them for the previous 12 years: they have opinions that count. Imagine if you’d spent two hours getting ready to go out for the evening and someone said, ‘You’ve not going out looking like that, are you?’ You’d be very _________. You’d never say that to an adult, because it shows a total _________ of respect.”

Palmano, who has a daughter aged 19, has even allowed the girl to hold several teenage parties at her home. “I’ve found that if you have brought your kids up to do the right thing, and then _________ them to do it, usually they’ll behave well,” she says. “I make them sandwiches and leave them alone. But I make it clear that they have to clear up any mess. I’ve never had a(n) _________; in fact, the kitchen was sometimes cleaner than I’d left it.”

She agrees that teenagers can be annoying: enjoying a world that is free of responsibility, yet _________ for independence. She doesn’t think, however, that they are _________ to annoy you. Until recently, scientists assumed that the brain finished growing at about the age of 13 and that teenage problems were a result of rising hormones and a desire for independence. But it turns out that the region of the brain that controls judgement and emotions is not fully __________ until the early twenties.

“This would explain why many teenagers can’t make good decisions, control their emotions, priorities or concentrate on several different things at the same time. __________, they may find it difficult to make the right decision between watching television, ringing a friend, or finishing their homework. It means that they do not __________ do the wrong thing just to annoy their parents,” says Palmano.

The key to __________ for all, Palmano believes, is calm negotiation and compromise (妥协). If you want your teenagers to be home by 11 pm, explain why, but listen to their arguments as well. If it’s Saturday, you might __________ agreeing to midnight (rather than 1 am, which is what they had in mind). If they are up to 20 minutes late, don’t react angrily. __________, ask if they’ve had a problem with public transport and let it pass; they’ve almost managed what you asked.

6 . A few years ago, a young woman at Facebook came to my desk and asked if she could speak privately. We headed into a conference room, where she began firing off questions about how I balance work and family. As the questions came faster and faster, I started to wonder about her urgency. I interrupted to ask if she had a child. She said no, but she liked to plan ahead. I inquired if she and her partner were considering having a child. She replied that she did not have a husband, then added with a little laugh, “Actually, I don’t even have a boyfriend.”

It seemed to me that she was jumping the gun but I understood why. From an early age, girls get the message that they will have to choose between succeeding at work and being a good mother. By the time they are in college, women are already thinking about the trade-offs they will make between professional and personal goals! When asked to choose between marriage and career, female college students are twice as likely to choose marriage as their male classmates. And this concern can start even younger. Peggy Orenstein, the author of Cinderella Ate My Daughter, related the story of a five-year-old girl who came home distraught from her after-school program and told her mother that both she and the boy she had a crush on wanted to be astronauts.When her mother asked why that was a problem, the little girl replied, “When we go into space together,who will watch out kids?” At five,she thought the most challenging aspect of space travel would be dependable childcare.

As I’ve mentioned, I’m a big believe in thoughtful preparation. Everywhere I go, I carry a little notebook with my to-do list. But when it comes to integrating career and family, planning too far in advance can close doors rather than open them. I have seen this happen over and over. Women rarely make one big decision to leave the workforce. Instead, they make a lot of small decision along the way, making accommodations and sacrifices that they believe will be required to have a family. Of all the ways women hold themselves back, perhaps the most pervasive is that they leave before they leave.