5
What do the following words mean? Work with a classmate and use a dictionary to help you. a b c d
6
e f g h
hover float sightings denied
Look at this information about UFOs. Do you think each statement is true or false? Discuss your ideas with a classmate. Be prepared to say why you agree or disagree with each statement. a b c d e
C
spotted identified temporarily rare
Nobody has ever seen an alien spacecraft. Some UFOs have been identified as balloons. Atmospheric events have been mistaken for UFOs. Some UFOs have in fact been military aircraft. People use special effects to ‘create’ UFOs.
7
Listen to an expert, Baruti Umangwa, being interviewed about UFOs. Listen for the objects in Exercise 4 and number them in the order the expert mentions them.
8
Listen again and check whether the statements in Exercise 6 are true or false.
Reading and vocabulary 9
In Section A you talked about aliens. Now you are going to read about living things. Before you read, find out what these words mean. Try to find a picture of each one on the Internet, or in an encyclopaedia or other reference book. atoms organs
molecules cells embryo foetus
organism tissues toddler adolescent
10 Look at this list of adjectives taken from the text. Each word has a similar meaning to one other word in the list. What are the two matching pairs? uniform
various
diverse
constant
11 What is life? While it is hard to give a clear definition of life, most biologists agree that living things have many characteristics in common. If something has these characteristics, it is considered ‘living’. Here are six basic characteristics of living things. What do you think they mean? adapted to its environment organised reproductive
developmental homeostatic responsive to stimuli
12 Skim the text on page 21 and match each of the six characteristics to a suitable paragraph (1–6).
20 Part 1: The world around us