A
Considering that Sundarbans National Park is situated in the tropics，September to March is the ideal time to come here．April，May and June are too hot while July and August often bring heavy season winds that limit travel and don’t make for a very pleasant sightseeing experience．You can really enjoy doing lots of charming things in the Sundarbans during September to March．
Take a river tour
Most tourists who explore the Sundarbans arrive in Khulna City first．From there，you can join a boat tour that travels south along the Ganges River through miles of preserved forest all the way to Kotka，where there is a beautiful beach along the Bay of Bengal．
Visit a bird habitat
This bird habitat is a nesting place for dozens of tropical birds found in the Sundarbans．The best way to observe these birds is climbing up the Sajnekhali Watchtower．If you’re lucky，you’11 also catch the famed Bengal Tiger making its rounds through the swampy jungle．
Visit the Mangrove(红树林)Interpretation Centre
If you wish to spend some time indoors out of the sweaty heat，go to the Mangrove Interpretation Centre．This place is very educational with many posters，maps and exhibits showing the wildlife and varieties of mangrove plants found within the park．You’ll also get to see crocodiles in a small pool．
Take a tour of local villages
Experience village life that has largely remained unchanged for centuries．In this vast tropical region，there are villages made up of various ethnic groups who rely on fishing，farming and working in the local through growing tourist industry for their livelihoods．The Sundarbans is a UNESCO world heritage site where you can visit villages and talk to locals，who will gladly share their culture with you．
21. Which month is suitable for a visit to Sundarbans National Park?
A. May． B. June． C. August． D. December．
22. What can visitors do in the Mangrove Interpretation Centre?
A. See some plants and animals． B. Put up posters about wildlife．
C. Feed crocodiles in a small river． D. Observe birds by climbing up the trees．
23. What is the author’s main purpose in writing the text?
A. To show visitors something attractive to do in the Sundarbans．
B. To introduce several charming villages in the vast tropical region．
C. To advertise some natural animal habitats．
D. To advocate the protection of forests in Khulna City．
