Section I Use of English
Directions: ( 略 )
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (1_) this is largely becanse, (2_) animals,we stand upright. This means that our noses are (3_) to perceiving those smells which float through the air, (4_) the majority of smells which stick to surfaces. In fact, (5_) ,we are extremely sensitive to smells, (6_) we do not generally realize it. Our noses are capable of (7_) human smells even when these are (8_) to far below one part in one million.