A

46. Have you ever experienced a traffic jam during your way to school? Have you ever imagined how fun it would be to fly to school? This Iron Man-style suit from a British company could make your dreams come true.The suit allows users to fly just like Iron Man. Wearers can take off vertically (垂直地) and fly through the air.

B

47. Food, water and shelter (居所) are basic human needs. But there are 1.2 billion people in the world who don’t have a proper house to live in, according to the World Resources Institute. The 3D-printed houses made by ICON in Austin may help to solve this problem.

C

48. People in some of the world’s most remote (偏遠的) places can’t get important medical products like vaccines (疫苗). But thanks to drones(無人機), this will no longer be a problem. It takes them about 15 to 30 minutes to send medical products to people in need.

D

49. Smog is a silent killer. It can cause diseases that harm our lungs. US company 3M has created a new material for roofing shingles (屋頂瓦片). The material makes use of the sun to fight smog. When sunlight hits the roof, the material on the roof is activated (被激活). It then changes harmful particles in smog into water-soluble ions (水溶性離子). Later, the ions can be washed away by rain.

E

50. James P Allison from the US and Japanese researcher Tasuku Honjo discovered a new kind of cancer treatment that earned them the 2018 Nobel Prize in Physiology or Medicine in October. The new treatment can make our immune systems (免疫系統(tǒng)) strong enough to effectively fight cancer cells. It is hoped that this treatment can be used to treat most cancers in the future.