— A study showed that people around the world are now using 129 billion face masks every month. But they have to throw them away after a short time.
—That is to say this could become a big ________ problem.
—That is to say this could become a big ________ problem.
| A．local | B．environmental | C．central |
更新时间：2022-10-12 19:06:42
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