SAT OwlIn 1928, Scottish scientist Alexander Fleming noticed that a mold growing on one of his culture plates had killed the surrounding bacteria. The mold was producing a substance that Fleming named penicillin. ______ mass production of the drug did not begin until the 1940s, when researchers in Britain and the United States developed ways to grow the mold in large quantities.
Which choice completes the text with the most logical transition?
However,
As a result,
Likewise,
In other words,
Show answer and explanation
Answer: A
Fleming discovered penicillin in 1928, yet mass production didn't start until more than a decade later. The second idea runs against what the first might lead a reader to expect, so a contrasting transition like "However" is needed.
"As a result" is wrong because the delay in production was not caused by Fleming's discovery.
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