Trắc nghiệm từ vựng Unit 10 lớp 9 Planet Earth

Many factories ________ harmful pollutants into the atmosphere.

Cuc Phuong National Park is the natural ________ for many rare species, both plants and animals.

Flora and fauna are vital to the environment because they create __________.

A food ________ shows you the order in which living things depend on each other for food.

With its diverse ecosystems and breathtaking landscapes, planet Earth is truly gorgeous. 

The bamboo forest is the natural _______of the panda.

Everyone can make a contribution to protect the environment.

A(n) ________ sunset over the savannah painted the sky with brilliant colours.

Many national parks are established to conserve the Earth's unique ________.

Scientists study the ________ to understand the formation and evolution of planets.

________, such as oceans and rivers, cover much of the Earth's surface.

A species whose presence is critical to maintaining the ecological balance is called a keystone species.