A. -- fashionable and attractive packages
B. -- a wide selection of colors and designs
C. -- reasonable price
D. -- quality assured
E. -- with a long standing reputation
F. -- economy and durability
G. -- have a long history in production and marketing
H. -- fine craftsmanship
I. -- rank first among similar products
J. -- timely delivery guaranteed
K. -- popular both at home and abroad
L. -- excellent in quality
M. -- various styles
N. -- complete in specifications
O. -- sophisticated technologies
A. -- fashionable and attractive packages
B. -- a wide selection of colors and designs
C. -- reasonable price
D. -- quality assured
E. -- with a long standing reputation
F. -- economy and durability
G. -- have a long history in production and marketing
H. -- fine craftsmanship
I. -- rank first among similar products
J. -- timely delivery guaranteed
K. -- popular both at home and abroad
L. -- excellent in quality
M. -- various styles
N. -- complete in specifications
O. -- sophisticated technologies
One of the most fashionable treatments for disease, gene therapy, has so far made little headway in tackling one of the most modish of illnesses, AIDS and the human immunodeficiency virus (HIV) that causes it. 46. The idea of gene-therapy treatment for HIV/AIDS would be to create a gene that, when placed in an infected person, would make all of the offspring of the cell into which it was inserted resistant to the virus. Even if the virus continued to destroy the patient’s immune cells, new ones that could not be infected would replace them. Eventually, the disease would no longer threaten the health of the patient.
A first step towards this has been achieved by researchers at the University of Pennsylvania and VIRXSYS, a biotechnology firm based near Baltimore. 47. Rather than inserting a gene directly, they removed the immune cells from people and replaced them with versions that had been modified to resist the virus. The results were published in thi
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