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A substance produced by
disease-transmitting insects could 1. Mosquitoes and
black flies transmit malaria and river blindness respectively,
both of` which 2 . However, scientists
have discovered, in some of these insects, a substance called
a peptide which can 3.
Recently introduced techniques have allowed researchers
to study these minute insects in order to 4. Professor John
Wells said that his team had discovered that the peptides
5. He pointed out
that if they could identify the genes responsible for producing
the substance, they could introduce into the world genetically
altered mosquitoes which 6.
In the wake of these exciting developments, it is hoped
that science will be able to eradicate some major tropical
diseases sooner rather than later.
A. were incapable
of` spreading the disease. B. kill the viruses and parasites they carry. C. provide the key to fighting these same diseases. D. cause a large number of deaths every year. E. find out more about the peptides. F. were active against parasites. G. were able to spread the disease.
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