Ответ:
Task 1.
1 - D; 2 - A; 3 - E; 4 - C; 5 - B.
1. brain cells (D)
2. mental performance (A)
3. chemical signals (E)
4. dairy products (C)
5. green vegetables (B)
Task 2.
1. Humans have billions of brain cells
.
2. Tiredness affects mental performance, when we are tired we cannot think clearly.
3. Dairy products like cheese and yoghurt have lots of protein in them.
4. Our brains are full of neurons that communicate using chemical signals.
5. Green vegetables
are an amazing source of omega-6.