15.Over many years, and through many rounds of multinational negotiations, the major trading countries of the world have worked through the General Agreement of Trade and Tariffs (GATT) to lower tariff and non-tariff barriers to ______ .
(A) protected industry (B) free trade (C) consumers (D) trade deficit
15.Museums should not only be a place to see art but, thanks to their architectural quality, should be an aesthetic experience in themselves.
(A)More than a place to display art, museums themselves are recognized as a piece of art.
(B)People can experience a trip of beauty if they know the value of architectural quality.
(C)Items displayed in museums are installed in the buildings by skillful architects.
(D)Architecture is by nature a form of art that is part of museum collections.
Gene therapy may be in its infancy, but great hopes for its potential to treat everything from cancer to
Alzheimer’s to heart disease are forcing it to grow up fast. After two decades of lab research, gene treatments are
increasingly making their way into human clinical trials. The bulk of research so far has focused on getting a gene to
its destination and coaxing it to turn on once inside a cell. On their own, genes can’t pass through cell membranes, and
much effort has been spent to trick cells into accepting foreign genes. The most efficient couriers are so-called viral
vectors: viruses whose genomes have been swapped out for therapeutic genes. Like Trojan horses, they slip genes into
target cells undetected. But as scientists are learning, there is no safe way to hijack a virus. The vectors sometimes trigger immune reactions. And once the genes are inside a cell, there is no way to be sure they will function as
intended. Case in point: a Paris gene therapy trial to treat SCIDs, or the “bubble boy disease,” restored immune
function in nine of 10 patients. But it was later revealed that two of them had developed leukemia.
【題組】47 “Viral vectors” are _____ .
(A) ways with which viruses genomes are changed
(B) viruses used for carrying genetic material into cells
(C) the paths through which viruses move
(D) immune reactions triggered by viral infection
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