your blood pumping from thrilling travels? Look no further! These tours and destinations will keep you on your toes all week long.

　　 Panama: This underrated destination is a little-known secret of the most travelers! Through this tour you'll get to hike, snorkel(浮潜) and explore all the best sights this beautiful country has to offer! Eight days tours for $250/day.

　　Canada: This diverse country is full of options. Explore the East of Canada and visit cities such as Montreal, Quebec or Toronto. If you're feeling adventurous, explore the Western part of the country with a Canadian Rockies Tour. During this twelve days tour you will hike a glacier for beautiful scenery and wander through postcard-worthy villages. Tours to Canada for $200/day.

　　Iceland: Check off one of the seven wonders of the world with a tour of the Northern Lights and Golden Circle. Spend seven days full of adventure like hiking glaciers, snowshoeing through Thingvellir National Park, relaxing in the Geysir Hot Springs and of course experiencing the glory of the Northern Lights! Seven days tours for $300/day.

　　South Africa: Discover the diverse culture and wildlife that makes up South Africa. Your tour plan includes a journey along the coast known as "Rainbow Nation". Here you will enjoy beautiful scenery, a hunting travel through Addo Elephant National Park and the wildlife in Tsitsikamma National Park. Nine days tours for $ 230/day.

21. What is the common characteristic of the travels mentioned in the text?

A. Exciting. B. Risky. C. Educational. D. Environmental.

22. According to the text, Panama is a destination which _______.

B. is not as famous as the other three B. you can go to for enjoying surfing

C. offers an option to hike in the park D. takes the most time of the four tours

23. Which of the following is TRUE?

A. Tourists can take a hot shower only in Iceland.

B. Tourists can hike glaciers in both Canada and Iceland.

C. Canada offers Rockies Tour for tourists to explore the East.

D. Tourists can enjoy a hunting travel through Tistsikamma National Park.