LEVEL 4: READING ALONE A greater variety of language and types of information than at level 3. More challenging vocabulary is introduced. Sentences remain clear
Describes various aspects of the Arctic and Antarctica including the animals that live there, the people who have explored them, and the changes brought to thes
This collection of squadron histories has been prepared by the USAF Historical Division to complement the Division's book, Air Force Combat Units of World War I
Now enhanced with the innovative DE Tools CD-ROM and the iLrn teaching and learning system, this proven text explains the "how" behind the material and strikes