Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

In southern Australia, there is a town where chimneys rise from the sand and there are big red signs warning people of "unmarked holes". This town is Coober Pedy, often known as the "underground" town.

Coober Pedy is a small town over 1,000 miles from Canberra, the country's capital. Today it has about 1,800 residents. Originally, residents of Coober Pedy were opal miners, and even today it is still a mining town.

The Coober Pedy region is mostly a treeless desert. Very little plant life exists due to the region's low rainfall and intense heat, so most of the residents live underground to escape the heat. They call their underground homes "dugouts". These dugouts remain at a constant temperature, while surface buildings need air conditioning. The average maximum temperature is 30-32°C, but it can get quite cool in the winter.

There are a number of underground hotels and tourist shops in the town. The town has become a popular stopover point and tourist destination.

I'm sure we will not waste money on unnecessary things.