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 mee?

A)

1. The other' (line 23): This refers to one of the dangers the hard-hat suit poses to divers.

2. them' (line 37): This refers to life on land i.e outside the water or marine life; where the divers live.

3. which' (line 45): This refers to the tanks that are attached to the back of the divers.

B)

1. Fresh air was supplied to the diver inside the hard-hat suit through the air pipe attached to a machine above the water.

2. Unwanted air was removed from the hard-hat suit through small openings made.

3. The dangers to the diver inside the hard-hat suit are the diver's sudden rise to the surface of the water due to great supply of air and crushing of the body due to the sudden dive into the water.

4. Flippers were worn by divers to increase their speed in water.

5. The divers were able to explore in cold water due to the availability of a special rubber suit which prevented heat loss.

6. The parts of the scuba are a mouthpiece attached to one or two tanks of compressed air.

7. The main advantage of the scuba is that it makes possible for a diver-scientist to work 200 feet underwater.

C)

The statement that is true is d) The idea of moving air around in the diving device belongs to an Italian.

Explanation:

I have been able to supply the answers attached to this passage.

The passage reveals the progression and processes that took place in the invention of swimming devices that enable swimmers /divers to perform activities underwater. Da Vinci designed a complete diving suit. But in 1680, an Italian Professor actually invented a large air bag which was to be won by swimmers. This gave later inventors an idea moving air around in diving devices. Then in 1819, Siebe, a German invented the hard-hat suit. Further inventions were made and improved upon.