阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    In the tenth grade，I began working for free at a vet's that was run by a friend. I wanted to get experience for what I thought would be my future job. However，on one particular Saturday morning I learnt something perhaps more important.

    The hospital was in the middle of one of the poorer sections of the city and some people could only pay for the most basic treatments. On this Saturday，a man and his young son，who was probably about 7 years old，walked in with a small cat in a cardboard box. There was something wrong with the cat's left eye. But the man could not afford to pay for the cost of the medicine. He kept quiet for a while，and then he asked where the nearest animal shelter was. Hearing this，his son cried and started to argue with him. All of a sudden，an older woman who was sitting in the waiting room stood up，walked up to the counter，and told the man that she would pay for the cost. The man thanked her and the son got to keep a healthy cat.

    I always thought it was the right thing to help out a needy person，but I only saw people do acts of kindness on TV or in movies. What the woman did made me believe that these things do happen in real life，and quite often.

Now，when I can't decide whether to help someone who is in need，I remember this woman，and then I have the courage to step up to the plate. Sometimes other people follow.

    Do you often dream at night? How do you feel when you dream? Is it useful to our health? “Dreams may be more important than sleep, and we all need to dream,” some scientists say.

    Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films. They are usually in colour. Some dreams are like old films. They come to us over and over again. That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find an answer. Some people get new ideas about their work from dreams. They may have been thinking about their work all day. These thoughts can carry over into dreams.

    Sometimes we wake up with a good feeling from a dream. But often we can't remember the dream. Dreams can disappear quickly from memory.

    Too much dreaming can be harmful. The more we sleep, the longer we dream. The mind is at work when we dream. That is why we may have a long sleep and still wake up tired.

    Like their ancient toga-wearing counterparts, modern philosophers continue to disagree on the nature of freewill. Do we really have any control over the choices we make and the things we desire, and if so, to what degree?

    Theories of freewill vary, but the ancient words of Plato still line up with our modern perceptions(概念) of temptation and willpower. The respected Greek philosopher argued that the human experience is one of constant struggle between the intellect and the body, between rationality and desire. Along these lines, true freedom is only achievable when willpower unchains us from bodily, emotional, instinctual slavery.

    You can find similar thoughts throughout world religions, most of which offer a particular and often difficult path to rise above our darker natures.

    And science? Well, science mostly agrees with all of this. Willpower is all about overcoming your natural desires to eat cupcakes, skip your morning workout, play games on mobile phone, hit the snooze alarm and check your e-mail during a funeral.

    Your willpower, however, is limited. If life were a video game, you'd see a glowing "willpower" or "ego"(自我) meter at the top of the screen next to your "life" meter. Successfully resist one temptation, and the meter drains a little. The next temptation drains the "willpower" meter even more, until there's nothing left at all.

    Our modern scientific understanding of willpower in large part stems from a 1996 research experiment involving chocolate and radishes(小红萝卜). Psychologist Roy Baumeister led a study in which 67 test subjects were presented with tempting chocolate chip cookies and other chocolate-flavored treats before a persistence-testing puzzle. Here's the catch: The researchers asked some of the participants to withdraw from sweets and snack on radishes instead.

    Baumeister's results told a fascinating story. The test subjects who resisted the sweet stuff in favor of radishes performed poorly on the persistence test. They simply didn't have the willpower left to resist slacking off(松懈).

    The research inspired more than a thousand additional studies discussing everything from the influence of positive messages to the ego-sapping power of daily decisions.

    Studies also show that cognitive capacity also affects our ability to hold out against temptation. Cognitive capacity is essentially your working memory, which you employ when resisting a temptation… or holding a string of numbers in your head. A 1999 study from the University of Iowa professor Baba Shiv found that people tasked with remembering a two-digit number held out better than people remembering a seven-digit number when tempted with chocolate cake.

    The Trans-Siberian Railway is a single train line that crosses nearly the complete length of Russia, from Moscow to Vladivostok. It covers a total of 5,772 miles, running from Europe to Asia. Unlike the longest flight in the world, which just began transporting passengers in 2018, the Trans-Siberian Railway started its business in 1916.

    Anyone who has taken this long journey, or even just part of it, will tell you that it travels at a rather slow speed, passing through some amazing, remote areas of Russia. You don't have to make the full journey without stopping. Instead, you're suggested to get off where there are attractive views, since it stops in some pretty fantastic places. But you certainly can take the full journey non-stop. If you do, the trip will take about 144 hours—six full days!

    You can book tickets with travel agencies. You can also make the booking online and tickets will be sent to your hotel or personal address. Children under 4 years old accompanied by adults can travel free, but cannot take up a seat. A child ticket needs to be bought if you want to get a seat for the child.

    There are longer railway services in the transportation world, but only one of them is a passenger line as some longer routes transport goods, not travelers. This railway may not be the fastest or the most modern, but it's clearly still an important player in the transportation world!

    More than great drinks, great rewards

    Enjoy all the benefits and more with your membership to our Loyalty Program!

    Whenever you pay with your membership account, you'll earn a Star.

    Collect more Stars, earn more rewards.

    Three ways to join us

    Buy a Starbucks Card handy to create an account

    Track your Stars online or through the mobile app, and we'll send an email when you've earned a reward.

    You can also join from your phone.

    Download the Starbucks App.

    One of the most exciting benefits of being a member is using our mobile app to: pay for purchases; view your Stars and rewards; access iTunes Pick of the Week; see current offers.

    Or you can join with specially marked coffee purchased at the grocery store.

    Enter your Starcode (limit: 2 per day)

    Look for the Starcode symbol on specially marked Starbucks products where you buy groceries.

    Three levels with increasingly greater rewards

    To reach each level in our Loyalty Program, you need to collect more Stars. (Remember: to earn a Star, you must pay with a registered Starbucks Card.)

    Welcome level

    To earn your first rewards, just register a Starbucks Card.

    Birthday drink or treat on us, birthday coupon (优惠券) for 15% off a purchase at StarbucksStore.com.

    Green level

    Collect 5 Stars within 12 months and you'll be in the Green level.

    What is included in the Welcome level plus

    Free in-store refills (续杯) on hot or iced brewed coffee or tea

    Gold level

    Collect 30 Stars within 12 months and you'll be at the Gold level.

    What is included in the Green level plus

    A free food or drink item after another 12 Stars earned

    Personalized Gold Card

Hot Technology Products at CES 2020

The consumer electronics show, or CES, presents new technology developments annually. Here are some latest products launched at CES 2020.

The Sero TV

Samsung introduced a TV that can be used to watch video designed for a smartphone. The Sero TV does this by turning itself from the normal TV position to an upright position that looks like the shape of a phone. The V can connect to mobile devices to play video directly from the phone.

Smart waste can

A company called TOWNEW presented; waste can designed for the home that does a lot of the dirty work on its own. When the can is full, the user touches a button to activate the machine's smart abilities. The device then completely closes off the waste bag inside, puts a new one in place, all by itself, and raises its top so the user can pick up and throw away the bag.

Invisible car hood(引擎盖)

Automobile industry company Continental showed off a new technology that seems to make the front end of a vehicle disappear. The technology, called "Transparent Hood," aims to make driving safer and easier. Cameras provide video of the area underneath the vehicle, permitting the driver to see objects and road conditions that might present danger.

Wearable air purifier

A company called Aō Air introduced a wearable air purifier. Designed to be a high-tech face covering to block pollution, the device pulls air through a filtration(过滤)system and then uses fans to create a small area of clean air at its front, allowing the air to be purified-without the need for a solid container.