A、Canoeing very well. B、Swimming very well. C、Identifying the direction well. D、Distinguishing saw grass from tall grass. C短文中提到

　　Welcome to Everglades National Park. The Everglades is a watery plain covered with saw grass that’s home to numerous species of plants and wildlife. At one and a half million acres, it’s too big to see it all today, but this tour will offer you a good sampling. (23) Our tour bus will stop first at Taylor Slough. This is a good place to start because it’s home to many of the plants and animals typically associated with the Everglades. You’ll see many exotic birds and, of course, our world-famous alligators. Don’t worry, there’s a boardwalk that goes across the marsh so you can look down at the animals in the water from a safe distance. The boardwalk is high enough to give you a great view of the saw grass prairie. From there we’ll head to some other marshy and even jungle-like areas that feature wonderful tropical plant life. For those of you who’d like a closer view of the saw grass prairie, you might consider renting a canoe sometime during your visit here. (24) However, don’t do this unless you have a very good sense of direction and can negotiate your way through tall grass. We’d hate to have to come looking for you. You have the good fortune of being here in the winter—the best time of year to visit. (25) During the spring and summer the mosquitoes will just about eat you alive! Right now they’re not so bothersome, but you’ll still want to use an insect repellent.
　　23. What can people do at the first destination Taylor Slough?
　　24. What ability should people have if they want to rent a canoe to observe the saw grass?
　　25. If people come here during the spring and summer, what is the most bothersome problem?