Genetherapy may be in its infancy, but greathopes for its potential to treateverythingfromcancer to Alzheimer’s to heartdisease are forcing it to grow up fast. After two decades of lab research, genetreatments are increasinglymakingtheir way intohumanclinicaltrials. The bulk of research so far has focused on getting a gene to its destination and coaxing it to turn on onceinside a cell. On their own, genes can’t passthroughcellmembranes, and mucheffort has beenspent to trickcellsintoacceptingforeigngenes. The mostefficientcouriers are so-calledviralvectors: viruseswhosegenomeshavebeenswapped out for therapeuticgenes. LikeTrojanhorses, theyslipgenesintotargetcellsundetected. But as scientists are learning, there is no safe way to hijack a virus. The vectorssometimestriggerimmunereactions. And once the genes are inside a cell, there is no way to be suretheywillfunction as intended. Case in point: a Parisgenetherapytrial to treatSCIDs, or the “bubble boy disease,” restoredimmunefunction in nine of 10 patients. But it was laterrevealedthat two of them had developedleukemia.
【題組】Whatdoes the word “trigger” mean in the passage?
(A) Activate (B) Shoot (C) Turn off (D) Plug
31. My son’s decisionhurt, but I deserved it—not simplybecause it highlighted my thoughtlessreaction to his gesture, but because it triggeredmemories of anotherlittle boy.
Which of the followingstatements is true?
(A) My memories of my son werereallyhurtful.
(B) My son did somethingungrateful to me and it served me right.
(C) No one was aware of my thoughtlessresponse to my son’s goodwill.
(D) My son got hurtbecause I pulled the triggeraccidentally.