At that time, the study on the development of vaccines became more urgent, as th

游客2023-12-30 9

问题 At that time, the study on the development of vaccines became more urgent, as the pandemic heightened people’s worries.

选项 A、intensified
B、lowered
C、accelerated
D、slowed

答案 A

解析 heighten(加强)；intensify(加强，增强)；lower(降低)；accelerate(加速)；slow(减缓)。

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