A、In January. B、In April. C、In October. D、In December. B

　　Costa Rica is at the southern point of Central America, borders to the north by Nicaragua and Panama to the south. It’s a little smaller than the state of West Virginia and largely mountainous with thin strips of low lands by the Pacific and Caribbean. Traditionally focused on exporting bananas and coffee, (16) Costa Rica’s new top industry is tourism. Many tourists arrive in the capital San Jose and head straight for the Pacific coast beaches. But if you are looking for something a little out of the ordinary, the country has several prime spots for volcano watching but the most popular is Arenal, near the town of La Fortuna. The volcano creates many hot springs. Costa Rica is rich in wild life and ranks as one of the most bio-diverse countries. Its national parks are home to everything from howler monkeys to white-faced capuchins(卷尾猴) It’s a bird watchers’ paradise with over 800 species. On the ground, tapirs (貘) sniff for food using their short trunks to grab leaves and fruit. (17) Along the coast, turtle watching is popular,
　　especially in April and May. Leatherbacks and green turtles lurch (东倒西歪地向前) upon to the beach to lay their eggs. They only rest for a little while before making the return trip back out to sea. So it’s natural that when you’re planning a trip, the right time to go depends on what you want to do. (18)The dry season for most of the country runs fishing and animal watching, so there is always something happening
　　16.  What’s the top industry of Costa Rica nowadays?
　　17.  When can tourists see turtles along the coast?
　　18.  When is the wet season for most of Costa Rica?