Plants don't bleed red and scream the way antelopes（羚羊）do when lions bite them,but they often die all the same if they can't defend themselves.A study by researchers at Missouri and the University of British Columbia proves that plants not only know when they're being eaten,but that they can tell several different insects apart even when they cat at the same time.
Appel and her coauthors-Jack Schultz,a University of Missouri researcher who led the study,and Joerg Bohlmann,a University of British Columbia researcher who performed genetic（基因的）studies,along with six others-planted Arabidopsis seeds in a lab and allowed them to grow to a size that caterpillars（毛毛虫）and worms love.Then they let the insects eat the plants.Plants lose water and tissue and,worse,might get infected（感染）with some sort of bacteria,but generally they live to see another day.
The researchers found that the plants produced chemicals that gave them the unpleasant smells to drive the insects away.Moreover,there were different genetic responses to each worm,showing that the plant actually knew what was eating them.
The study,financed by the National Science Foundation and published in the journal Frontiersin Plant Science,wasn't carried out for charity.Arabidopsis is an important plant that can bring in a lot of money for farmers.
This could allow agriculturalists who grow and design cash crops to give them the skills to drive off farm pests（害虫）."If we want to grow plants that can keep insects away," Appel said,we might as well find out how they respond to different insects that feed on them.



What is the best title of this text？ ______

A. Plants can know which insects are eating them
B. New plants help farmers earn more money
C. Scientists found a new way to grow plants
D. Scientists found plants could protect themselves

How do plants protect themselves？ ______

A. By changing their genes.
B. By producing special chemicals.
C. By loosing water and tissue.
D. By telling who is eating them.

What shows that plants know who is eating them？ ______

A. Plants have different genetic reactions.
B. Plants produce the same chemicals.
C. Plants have skills to drive off farm pests.
D. Plants can tell several different insects apart.

The result of the study can be helpful to ______ .

A. protect a rare plant from dying out
B. deal with pests
C. to design a new kind of insect
D. raise money for charity