If you always hate certain vegetables. you may be more than a picky eater. Instead, you might be a “super-taster”, a person     1     biter genes(苦味基因). Those people who have the “biter genes” are 2.6 times more likely to eat     2     (few) vegetables than others, according to a new study     3     (present)at the annual meeting of the American Heart Association.

“We don’t get the taste of food equally,” said Professor Duffy, an export in the study of food taste. “It could explain some of the differences in our food     4     (prefer)”. About half of us can taste bitter and sweet, so we are not especially sensitive to bitter food. Another 25% are called “non-tasters” to     5     bitter food might be a bit sweeter. The rest of us are     6     (extreme) sensitive to the bitterness that some     7     (plant)develop to keep animals from eating them.

Food scientists are trying to develop ways     8     (reduce)the bitterness in vegetables, in the hope that we can keep “super-testers” from rejecting vegetables. In fact, some vegetables we grow today     9     (be)much sweeter than before.

We might also try to use various cooking methods, either by adding me fat, sweetness, strong flavors like garlic     10     roasting them, to improve the taste of the vegetables.

5 . Artificial cloud technology could soon be used in the fight against environmental damage. Researchers in Australia have used machines to spray salt water into the air, and noted that the reflective qualities of these artificial clouds helped protect the Great Barrier Reef from sun bleaching (漂白).

The so-called cloud brightening project works by thickening existing clouds and reducing sunlight exposure to protect the reef. No artificial chemicals make it into the clouds in the sky. When water droplets steam, they leave only small salt crystals that float up into the atmosphere. This provides a larger surface area for water vapor to be liquids around them, forming thicker clouds.

The past two years have seen uncommon forest fires and droughts triggered by the climate change emergency, meaning that widespread use of this technique may become more commonplace if carbon emissions are not checked.

Drones, unmanned flying vehicles, have also entered the cloud controlling picture, used in the United Arab Emirates, a country desperately in need of more rainfall, to deliver electrical shocks to clouds in order to facilitate rainfall. Zapping (击打) clouds to produce a positive or negative charge within clouds can cause water droplets to form together. The greater the charge, the larger the droplets, which is vital for ensuring that as much rain as possible reaches the surface before steam gives off all the hard-won moisture (水分).

Even if one waves aside climate change, global waterfall shortages are still an increasing concern, given the planet’s booming population. More people means more mouths to feed, and the demand for water in agriculture for animals and crops further increases urgency for cloud controlling technology. An increase in rain also leads to positive economic growth in many countries, as large harvests stabilize financial systems and living standards in all climates.

Increasingly, scientists are looking to our skies in providing solutions to protect our environment. Cloud controlling technologies have promise. However, for this field of science to become practical economically, more research needs to be done in making this process a practicable option in protecting our environment.