The adjectives from science and biology have the stress on a different syllable from the base word.

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7     Bats can see just as well as humans. Like dogs, bats rely heavily on other senses like hearing and smell. They have a very advanced sound-based system called echolocation, which allows them to know where they are when they are flying at night.

Page 95 exercise 2c

person

adjective

subject

scientist

scientific

science

chemist

chemical

chemistry

biologist

biological

biology

physicist

physical

physics

geneticist

genetic

genetics

The adjectives from science and biology have the stress on a different syllable from the base word.

Page 95 exercise 2f

1     laboratory

2     discovery

3     theory

4     drugs

5     research; side effects

6     guinea pigs

Page 96 exercise 4a

Three (Alexander Bogdanov, Thomas Midgley, and Louis Slotin) died as a result of their experiments or inventions.

Page 96 exercise 4b

1     C

2     B, D

3     B

4     D

5     A, C

6     B

7     C

8     A

Page 97 exercise 4c

anaesthetic /anəsˈθetɪk/

nitrogen /ˈnaɪtrədʒən/

blood transfusion /blʌd transˈfjuːʒn/

donors /ˈdəʊnəz/

malaria /məˈleərɪə/

tuberculosis /tjuːbɜːkjuˈləʊsɪs/

lead /led/

additive /ˈadətɪv/

polio /ˈpəʊliəʊ/

nuclear /ˈnjuːklɪə/

lethal dose /ˈliːθl dəʊs/

Page 97 exercise 5a

1     Both

2     Neither

3     all

4     All the

5     everything

Page 97 exercise 5d

1     move only in one direction. (a)

2     in both liquid and solid form.(c)

3     all day (b)

4     hardly any of it (a)

5     either other animals or eggs (b)

6     only by instance heat (c)

7     nearly six minutes (b)

8     Pluto is no longer considered to be a planet (c)

9     some of that air is oxygen (c)

10   nearly sixty seconds (a)

10B

Page 98 exercise 1a

The first man to land on the moon was Neil Armstrong in 1969.

Page 98 exercise 1b

That’s one small step for man, one giant leap for mankind.

1     A step = the act of lifting your foot and putting it down in order to walk or move somewhere. A leap = a long or high jump; a sudden large change or increase in something.

2     Mankind = all humans, thought about as one large group; the human race.

Page 98 exercise 1c

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