Question

2
Reading
Using prior knowledge
10.2.2 10.4.2 What do you know
about oxygen? Which of the
sentences below are true?
Listen, read and check.
1
2
Oxygen powers our
bodies.
Oxygen is toxic in
large amounts.
The first life forms
needed oxygen to
survive.
4 Oxygen is the main
product of
photosynthesis.
3
5 Animals were smaller
in the past because of
oxygen.
6 The amount of oxygen
in the atmosphere
has been constant
through time.

Answer 1

Ответ:

1 Oxygen powers our bodies. - True

2 Oxygen is toxic in large amounts. - True

3 The first life forms needed oxygen to survive. - False (they were able to survive without oxygen)

4 Oxygen is the main product of photosynthesis. - False (it's a by-product, not the main one)

5 Animals were smaller in the past because of oxygen. - False (they were much bigger in the past, 300 million years ago)

6 The amount of oxygen in the atmosphere has been constant through time. - False (First, the amount of oxygen increased  steadily, up to 50%,  and then it fell down to just 12%)

Объяснение:

1 Кислород питает наши организмы. - Верно

2 Кислород токсичен в больших количествах.  - Верно

3 Первые формы жизни нуждались в кислороде, чтобы выжить. - Неверно (они могли выжить без кислорода)

4 Кислород – основной продукт фотосинтеза. - Неверно (это побочный продукт, а не основной)

5 В прошлом животные были меньше из-за кислорода. - Неверно (в прошлом, 300 миллионов лет назад, они были намного больше)

6 Количество кислорода в атмосфере остается постоянным во времени. - Неверно (Сначала количество кислорода неуклонно увеличивалось, до 50%, а затем упало всего до 12%)

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