Listening skill
Today I
listen VOA special English Agriculture report about some studies begin by
accident. Cynthia Sagers is a biology professor at the university of Arkansas.
Meredith
Schafer is a graduate student. They were traveling in the state of North Dakota
on a project. They noticed pretty yellow flowers. Farmer grow canola for seeds
to make cooking oil. Canola is used for animal feed and biofuel but the canola
plants they saw were not growing in farm fields.
The researchers
decided to test the plants. They had brought along special testing papers for
the project they were working on. They crushed some of the leaves in water and
added the test strips. The results is the weedy canola plants contained genetic changes. If a plant is genetically
modified, its mean genes have been changed to produce desired qualities.
The researchers
traveled more than five thousand kilometers to find canola. They stopped every
eight kilometers to count plants and take samples to test vehicle. They finding
at a recent meeting of the Ecological Society of America. The scientists
found canola plants in almost half of the places they investigated.
They
tested a total of two hundred eighty – eight plants. And the plants contained
genes from genetically engineered canola. Some crop plants are modified to
resist damage from the chemicals that farmers spray to kill weeds. There are
two proteins that can give canola the ability to resist two commonly used
herbicides.
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