1. The aim of "Holiday Economy" and its positive effects. 2. Problems derived from "Holiday Economy". 3. My suggestions.

A．condemning the U.S. for its failure to provide better medical care to the poor
B．evaluating the relative significance of factors contributing to the poor health status in the U. S.
C．providing information which the reader can use to improve his or her personal health
D．comparing the health status of the U.S. population with that of the world averages

A．the potential impacts of climate change for natural ecosystems
B．how to minimize the negative consequences of climate change
C．how to maximize the opportunities that climate change may offer
D．the complex, nonlinear nature of natural ecosystems