A. It was invented during World War II.

B. It was available in people＇s homes since 1902.

C. It was invented by Willis Carrier.

D. It was available immediately after its invention.

A. Working outside in the yard.

B. Baking breakfast in the yard.

C. Making lemon juice.

D. Enjoying the air conditioning.

A. A weather machine.

B. A personal ice cream machine.

C. A portable air conditioner.

D. Air-conditioning clothes.

A. He was often offered an ice- cold drink after work.

B. He always wore wet clothes to keep cool.

C. He kept cool in summer by swimming in a stream.

D. He was happy to get sunburned when working outside.