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▲閱讀下文，回答第 31-35 題According to scientists, frogs are disappearing from the earth. Since 1997, the frogpopulation has dropped ( 31 ) 2 percent every year. Some frog species have completely ( 32 ).No one can be sure why this is happening, but a number of scientists are looking into it.Joe Pechmann, a professor at the University of New Orleans, has been studying frogs for 18 years.He believes there are several stresses on our planet that are killing off frogs. These problems( 33 ) pollution, global warming and loss of the frog habitat due to human population growth.Pechmann warns the loss of frogs should be ( 34 ) seriously. “It makes sense in theory thatwhat happens to frogs will happen to us,” he said. Even if we aren’t at ( 35 ), we may have totake responsibility for the extinction of frog species that have managed to survive for millionsof years.
31.
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