Ecotourism is one of the most rapidly growing form of specialized travel in the West, with central American countries, such as Costa Rica,（）the principal destinations at present.
A: be
B: to be
C: being
D: been
A: be
B: to be
C: being
D: been
举一反三
- ________ about one of the most rapidly changing countries in a ceaselessly changing world is not all easy. A: A Being informed B: B To be informing C: C Have in formed D: D Informed
- The countries that implemented formal dollarization in 2010 include（ ）. A: Panama B: Ecuador C: Costa Rica D: Zimbabwe
- Why did people laugh when the first one was being built in Central Park West?
- Q23.Where is Costa Rica? A: a). It's situated in South America. B: b). It's above Mexico. C: c). It's located in Central America. D: d). It's in South Africa.
- This passage chiefly discusses ______. A: the growth of world population B: one type of the exponential rate C: the population problem of more rapidly growing countries D: the possible ways of dealing with the rapid population growth