Tiêu đề 01. HS - Unit 6 Test 1.docx ✅

local cuisine and having conversations with the local people. Trekking adventures We have trekking holidays to famous places such as Machu Picchu or the Everest Base Camp Trek. You just need to be fairly fit, (33) ________ on trails and avoid dropping litter. You'll love spending time in the great outdoors with a lot of new friends. Some trips can last over 3 days, but don't worry! We'll make sure that you (34) ______ the best homestay accommodation. Wildlife holidays In Africa, Asia and South America, we arrange small-group journeys to experience nature. You can visit Galápagos Islands to look at giant tortoises and other (35) _____ species which only exist on those islands, or you can go on a safari in Africa to see lions and giraffes. Also, you can ride an elephant in a safari in Sri Lanka. 31. A. see B. touch C. hurt D. drop 32. A. break B. pick up C. cross D. harm 33. A. stay B. ride C. run D. drive 34. A. live B. experience C. try D. sleep 35. A. normal B. natural C. usual D. endangered Read a text about polar bears. Circle the letter A, B, C or D to indicate the best answer to each of the questions. POLAR BEARS NEED HELP The polar bear was listed as an endangered species in spring 2008. An endangered species is the one that can become extinct in the near future, according to the Endangered Species Act of the United States. The polar bear is the first animal to be listed as endangered, primarily due to global warming. Increased levels of carbon dioxide (CO 2 ) and other greenhouse gases trapped in the atmosphere are the main causes of global warming, a form of climate change. Oil and gas heaters, gasoline- powered vehicles and coal-fired power plants all use fossil fuels which cause global warming. The polar bear's habitat is more vulnerable to climate change than many other species. The sea ice in the Arctic is the place where polar bears spend most of their time fishing and storing up fat. A large number of polar bears have moved to land and lived off their stored fat recently. Global warming is causing the ice to form later and melt earlier in the Arctic. As a result, the polar bear's feeding season is shortened. To find ice, some take great risks, and they will drown from exhaustion and hunger if they have to swim far away from the sea ice in order to hunt other animals on land. More than 25% of the Arctic Ocean ice is estimated to have disappeared in the