Directions:
 Read the following text. Choose the best word(s) for each numbered blank and mark A,B,C or D on ANSWER SHEETl.(10 points)The human nose is an underrated tool Humans are often thought to be insensitive smellers compared with animals, (1)________ this is largely because, (2) ________ animals, we stand upright, this means that our noses are (3) ________ toperceiving 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.