懂你英语流利说Level4－Unit1 1/4 Vocabula

Headaches can be very painful and can last for a long time.

If you have a headache  your head hurts.

A sprained ankle can be so painful that you can't walk.

Someone with the sprained ankle may need to use car walk.

If you have  sore throat ,it may be painful to  swallow.

A sore throat can be cause by viruses or  bacteria.

A burn is an injury to the skin  cause by fire or hit.

If you get too close to a fire you will be burned.

And earache is a sharp dull or burning pain in the year.

How many causes of the earaches include...  or water in the year.

Mountains are land from hire than 2 thousands feet were about...

Hills are like mountains, but not as tall.

Mountains are formed by forces deep within the Earth and are made of many types of rocks.

Rivers are ...

The place where a river begins is its source.

Many early cities were built alongside rivers.

Most of the world's water is in the oceans, which are large bodies of salt water.

The Pacific Ocean is the largest and deepest ocean,coverning more area than all the continents put together. 

The oceans are also an important source of oxygen.

Dessert are areas of land that receive little or no rainfall.

Dessert temperatures can range from cold at night to very hot during the daytime, often above 120 degrees F.

The amount of rainfall in some deserts is so low that only a few plants can survive.

A valley is a low, relatively flat area between hills or mountains, often with a river running through it.

Some valleys are formed by flowing water, and others are formed by glaciers.