Students Book

c
CD3 T18 Read the text again and listen.
Tick the correct answers.
1 Newton and Nashida believe that animals
eat plants in a similar way to how humans
take medication,
a but the behaviour they noticed
among chimpanzees did not
confirm this.
b but they have not been able to
draw conclusions about their
behaviour yet.
c after carefully studying their behaviour
and drawing their conclusions.
2 Aspilia is a plant that chimpanzees
a often eat because of its
delicious leaves.
b are only thought to eat for
certain reasons.
c never eat because its leaves
are sharp.
3 The fact that aspilia is also used by
humans for medical reasons
a shows scientists that chimpanzees
are more often ill than humans.
b is something that scientists did not
initially expect.
c shows scientists that humans and
animals have similar knowledge
about illnesses.
4 The conclusion that chimpanzees use
these plants for medical reasons
a is the only possible explanation these
scientists have for their behaviour.
b is one of two possible explanations
these scientists have for their
behaviour.
c is one of several possible
explanations these scientists have
for their behaviour.
5 Sodium has a certain chemical effect
that helps elephants in Kenya
a to digest some of the poisonous
plants they eat.
b to sharpen their tusks when they
break off the rocks.
c to eat the soft rocks they find in a
cave in Mount Elgon.
2 Grammar
Passive report structures
a Find and underline sentences in the text
which mean the same as these sentences:
1 Experts think that chimpanzees in the wild
choose certain herbs...
2 Experts know that local people use...
3 Experts say that elephants in western Kenya
go regularly...
b Compare the sentences in Exercise 2a with
the sentences in the text. What difference
is there in the form of the verbs think, know
and say?
c Rewrite the following sentences, using
passive report structures.
1 Experts think animals have very strong
instincts.
Animals are thought to have very strong
instincts.
2 People say animals can do many things that
we have no idea about.
Animals
lots of things that
we have no idea about.
3 Experts know some animals eat only certain
plants.
Some animals
only certain
plants.
4 Experts believe certain animals can make
very intelligent decisions.
Certain animals
very
intelligent decisions
5 Scientists say dolphins are among the most
intelligent creatures.
Dolphins
among the most
intelligent creatures
6 People know dogs behave in very strange
ways when they are ill.
Dogs
in very strange ways
when they are ill.
7 Experts believe that different animals have
different ways of communicating with each
other.
Different animals
ways of
communicating with each other.
8 Experts say lots of animals are dying out
every year.
Lots of animals
out every
year.
UNIT 13 97