問題詳情

Passage B
      Where did the Coronavirus come from? After five months and over 225,000 people    26    , thequestion is the subject of a vicious spat between America and China. By far the most likely explanation isthat the virus jumped from bats to humans, perhaps via another animal such as a pangolin, at a wet market inWuhan. But conspiracy theorists mutter that the bug could have escaped from one of the city’s laboratories,at least two   27    do research on   28    diseases. Some American politicians, including PresidentDonald Trump, want an investigation; China retorts that the claims are “malicious”. In March, one of itsspokesmen claimed that the virus might have come from America. The risks corrode public confidence in thecrucial disease laboratories. It is also a reminder of why China’s official culture of opacity and propaganda issuch a profound weakness.
       The virus shows no sign of deliberate human construction and there is no reason to doubt that it evolvedentirely in the wild. But accidents do happen. Bugs studied during legitimate experiments in laboratorieshave escaped in the past. SARS, a virus that killed 774 people in 2002-03, slipped out of a lab in Beijingtwice in 2004. A sample later escaped from a research institute in 2007, but was contained. America suffered34 laboratory-acquired infections in 2000-09,    29    four deaths. American labs have accidentally shippedlive anthrax, bird flu and Ebola to lower-security facilities in recent years. One health-security index suggeststhat three-quarters of countries   30    biosecurity.
26.
(A) affecting
(B) affected
(C) affect
(D) affects

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