Although the ecological environment wasbecoming better, the problems were still seriou

The author’s attitude to the ecological situation of the tropical forests is ______.A．Mann

The phrase "one another" in the passage refers toA．populationsB．racesC．ecological conditio

What does the word "xenophobia" （Line 3, Para. 2) mean？A．The ecological disorders.B．The pa

Which of the following best represents the view of ecological communities associated with

According to paragraph 2, Clements compared the process of ecological succession toA．the r

What is the purpose of the research on Dead Sea？A．To uncover layers of ecological history.