Ⅲ.综合运用

Why Is the Durian So Smelly？

One of the smelliest fruits in the world is the durian.But why is the durian so smelly?Now,the secrets of this fruit have been r__1__by a group of scientists in Singapore.

According to the scientists，a group of genes give the durian its notorious smell.These genes are r__2__for volatile Sulphur（硫化物）compounds in the fruit and they become highly activated as the fruit ripens.That's why many people think that the durian smells l__3__sulphur.

The discovery m__4__the possibility of creating“odorless”durian in the future.But durian fans would like to keep the special smell.“What would the durian be like if it's odorless and tasteless?I w__5__someone would create other fruits with durian smell.Durian fans will know what I am talking about,”one durian lover said.

According to the study,the durian's unique odor plays an important role in the wild:helping to a__6__animals to eat the fruit and spread its seeds.

Scientists have also found that the durian's ancestry d__7__back 65 million years to the cacao plant.“So we're basically eating chocolate,”said the scientists.

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