The number of the insects is________so rapidly that it causes concern of the local people.

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问题 The number of the insects is________so rapidly that it causes concern of the local people.

选项 A、expanding
B、circulating
C、exporting
D、spreading

答案A

解析 expand：增加，扩大，增强(尺码、数量或重要性)；circulate：循环；export：出口；spread：扩散，传播。根据句意可知，选A。

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