Tolonglah bantu saya mengerjakan soal iniAmbient divers, unlike divers who go underwater in submersible
vehicles or pressure-resistant suits, are exposed to the pressure and
temperature of the surrounding (ambient) water. Of all types of diving, the
oldest and simplest is free diving. Free divers may use no equipment at all, but
most use a face mask, foot fins, and a snorkel. Under the surface, free divers
must hold their breath. Most free divers can descend only 30 to 40 feet, but
some skilled divers can go as deep as 100 feet.
Scuba diving provides greater range than free diving. The word scuba
stands for self-contained underwater breathing apparatus. Scuba divers wear
metal tanks with compressed air or other breathing gases. When using open-
circuit equipment, a scuba diver simply breathes air from the tank through a
hose and releases the exhaled air into the water. A closed-circuit breathing
device, also called a rebreather, filters out carbon dioxide and other harmful
gases and automatically adds oxygen. This enables the diver to breathe the
same air over and over.
In surface-supplied diving, divers wear helmets and waterproof canvas
suits. Today, sophisticated plastic helmets have replaced the heavy copper
helmets used in the past. These divers get their air from those a hose connected
to compressors on a boat. Surface-supplied divers can go deeper than any
other type of ambient diver.

1. When using closed-circuit devices, divers
a.receive air from the surface
b.breathe the same air over and over
c.exhale air into the water
d.hold their breath

2. According to the passage, surface-supplied divers today use helmets made from
a.Canvas
b.Glass
c.Plastic
d.Copper​