Basic actitivies (computer-graded)
Smaller than bacteria, viruses are microscopic organisms that need another living thing - a host - to live and multiply. This unit teaches the most important vocabulary to discuss viruses as well as the dramatic spread of illnesses to cause epidemics and even pandemics.
Pick the correct answer from a list.
Listen to the word and type it in.
Type in the correct answer for each definition.
Advanced activities (teacher-graded)
Record yourself speaking English.
Pick a question and write about it.