The following are introductions to some programs that BBC I will show on TV.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Driving in Canada is similar to driving in many parts of the United States. Distances and speeds, however, are posted in kilometers per hour and some signs, particularly in Quebec, may only be in French.

    Unless otherwise posted, the maximum (最大限度的) speed limit in Canada is 50km/hr in cities and 80km/hr on highways. On rural highways, the posted speed limit may be 100km/hr. It is illegal to take automobile radar detectors (汽车雷达检测器) into Quebec, Ontario, Manitoba, and the Yukon. Seat belt use is required by law for all passengers, and child car seats must be used by children under 40 pounds. Some provinces require drivers to keep their vehicles' headlights on during the day and some have banned (禁止) driving while using a hand-held cell phone. Motorcycles cannot share a lane (车道), and safety helmets for motorcycle riders and passengers are necessary. Running a red light is a serious crime throughout Canada and drivers are advised to stop before starting when a light turns green.

    Winter travel can be dangerous due to heavy snowfalls and icy conditions. Some roads and bridges are often closed in winter. Snow tires are required in some provinces. Travelers should also be careful about animals while driving at night in rural areas.

    Highway 401, from Detroit to Montreal, is one of the busiest highways in North America. It has been the scene of many deadly traffic accidents due to sudden and severe weather changes, high rates of speed, and heavy truck traffic. Thus drivers should be alert while travelling here.

    Please refer to our Road Safety page for more information. Also, we suggest that you visit the website of Canada's national authority responsible for road safety.

    Hundreds of years ago, a Roman army came north from England to make war on Scotland. The Scots, a brave people, love their country. They fought hard to drive the enemy out of Scotland. But there were too many of the Romans. It looked as if the Romans would win.

    One night, the leader of the Scots marched his soldiers to the top of a hill. “We will rest here tonight, my men,” he said, “Tomorrow we will fight one more battle. We must win, or we will die.”

    They were all very tired. So they ate their supper quickly and fell asleep. There were four guards on duty, but they were very tired, too, and one by one, they fell asleep.

    The Romans were not asleep. Quickly they gathered at the foot of the hill. Slowly they went up the hill. Closer they came to the sleeping Scots. They were almost at the top. A few minutes more the war would be over. Suddenly, one of them put his foot on a thistle (蓟). He cried out and his sudden cry woke the Scots. In a minute they were on their feet and ready for a battle. The fighting was hard, but it did not last long. The Scots wiped out the Romans and saved Scotland.

    The thistle is not a beautiful plant. It has sharp needles all over it. Few people liked it. But the people of Scotland liked it so much that they made it their national flower.

    A single dose(剂量) of an experimental vaccine(疫苗) can protect mice against the Zika(寨卡) virus, raising renewed hope of a vaccine for humans, say scientists. The US team say the results, published in Nature, are "striking" and should encourage research efforts.

    Tests in humans could begin in months. But even if these go well, a licensed vaccine for widespread use to protect those at most risk ­ such as pregnant women ­ would still be years away, experts advise. Zika has been spreading across Central and South America and, most recently, Africa. More than 60 countries and territories now have continuing transmission(传播) of the disease, which is carried by mosquitoes. The virus causes serious birth damages during pregnancy and has been declared a global public health emergency.

    Now, developing a vaccine for pregnant women to protect their unborn babies is an international research priority(优先事项). US scientists from the Walter Reed Army Institute of Research, the Beth Israel Deaconess Medical Center and Harvard Medical School tested two types of Zika vaccine in mice – one based on bits of genetic(基因的) code from the virus and another that is an inactive (and therefore harmless) copy of Zika. Both worked well, protecting every mouse that was immunised against the virus. In comparison, all of the mice not given the vaccine caught Zika after they were exposed to it.

    Researchers say they will push ahead with developing the needed virus vaccine. There are many existing vaccines for other disease that use this type of technology, while there are relatively few DNA­based vaccines. Of course, future tests will need to check the vaccine is safe and effective in humans, as well as how long the immunity might last.

    It is true that summer is hot. But here is something to make your day easier. Are you prepared? Meet the new AirFreez— an alternative to traditional Air Conditioners that cools you just the same!

    How does it work?

    It is surprisingly easy to set up! You just need to plug it into a socket(插座)OR any USB port (it uses so little energy that it can even run off of a phone or laptop battery).

    Once you have done that, simply fill it with 20oz/0. 6L of cold tap water.

    Now just press the power button and the instant cool air is here!

    What is so special about this little box?

    It is no larger than a lunchbox. It can be powered by a pocket solar panel（电池板）or battery pack and you probably have the world's first and most portable AC unit.

    Bad sleepers are putting the AirFreez next to their beds at night. The relaxing blow of cool, clean air, the comforting soft night light and the quiet create the perfect sleeping conditions!

    The price is just amazing. Most AC units cost at least $ 300+ AND you have to pay more to cover the expensive electricity bills each month. AirFreez costs less than $ 100 (actually $ 53 if you buy more than one here).

    Top Tips:

    To make your air even cooler—add a bottle of cold tap water from your refrigerator or even ice!

    For a beautiful relaxing atmosphere—add a few drops of fragrant oils to the water!

    Over the past 40 years, China has helped more than 700 million rural residents out of being poor, and the poverty rate -- the proportion of people living below the Chinese poverty line -- had fallen among the rural population from 97.5 percent in 1978 to 3.1 percent at the end of 2017, official figures shows. China's achievements in poverty alleviation (扶贫) made the world look at China with admiration.

    "For me, it is unbelievable that over 40 years, that is, over the course of one working lifetime, China has gone from one of the poorest countries in the world to one that is about to eliminate(消除) absolute poverty," said Craig Allen, president of the US-China Business Council.

    Varaprasad Sekhar Dolla, a professor of Chinese studies at India's Jawaharlal Nehru University, also spoke highly of China's achievements in poverty reduction. "If global poverty came down greatly in the last three or four decades, it's partly because of the Chinese contribution to reducing poverty within its own national boundaries," said the Indian scholar.

    In the eyes of Khairy Tourk, a professor of economics with the Stuart School of Business at the Illinois Institute of Technology in Chicago, "many countries look up to China to learn from its experience." "The Chinese experience is based on building a modern infrastructure (基础设施) and then on setting up special economic zones that would help underdeveloped countries to become more industrial," he added.

    In the government work report delivered at the opening of the annual NPC session (全国人大会议) on March 5, China promises to reduce its population of rural poor by over 10 million this year.