A. What do the following refer to? 1. The other' (line 23): The other 2. them' (line 37):
3. which' (line 45):
B. 1. How was fresh air supplied to the diver inside the hard-hat suit?
2. How was unwanted air removed from the hard-hat suit?
3. What were the dangers to the diver inside the hard-hat suit? a) b) Cime rnt
4. Why are flippers worn by divers? 5. What enabled the divers to explore in cold water?
6. What are the parts of the scuba? 7. What is the main advantage of the scuba?
C. Mark the best choice. Which of the following statements is true?
a) Before the 15th century man wasn't able to stay underwater.
b) Although Siebe's diving suit was not successful, it opened the way for later
c) Da Vinci was the first to suggest the idea of supplying air to the diver from an air bag.
d) The idea of moving air around in the diving device belongs to an Italian.

Do you help me ?please