Cloze

Directions: In this part, there is a passage with ten blanks. For each blank there are four choices marked A, B, C, and D. Choose the best answer for each blank.

     Why do kids hate Brussels sprouts(芽甘蓝)? Because Brussels sprouts are bitter, and kids generally don't like bitter tastes. But it's not their . Researchers say that a dislike for bitter and sour is a survival instinct, since most toxic substances  that way too. On the other hand, sweetness typically indicates that something is  to eat, so children are born with a  for sweets.
     What we like to eat changes over time. As we age, we realize that  something tastes bitter or sour, it won't kill us, and we learn to  it. When we're older, we  some of our smell sensitivity. Humans need smell to experience flavor, which is different from taste. With our senses diminished, we'll probably begin  sugar and salt to our food, to heighten the flavor. , there's a theory that the reason many especially "big"-tasting wines in recent years have won awards is that wine critics are getting older and finding subtle flavors  to sense.
     If someone is  to detect flavors at all, he may have a taste , which can be caused by a tongue injury or brain damage. Or it could be a problem with . The channel that separates the mouth from the nose allows us to smell behind our nose and is  enjoying most complex flavors. That's why food seems  when we have a stuffy nose—except chicken noodle soup. It's so salty.