Scientists who study ________ noise say that ________ average noise level in New York is 72.5 decibels.
| A．/；the | B．/；an | C．the；an | D．a；the |
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Scientists who study ________ noise say that ________ average noise level in New York is 72.5 decibels.
| A．/；the | B．/；an | C．the；an | D．a；the |
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