I apologize for any confusion. Let's clarify the options regarding Celsius thermometers:
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They can contain mercury that is very harmful to humans. - This is true for some types of thermometers, but many modern thermometers do not use mercury.
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They can take accurate temperature readings. - This is an advantage, not a disadvantage.
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They can measure temperatures of liquids quickly. - This is also an advantage.
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They can measure the boiling point of a liquid. - This is another advantage.
Given these clarifications, the most suitable disadvantage due to the potential health risks (in the context of traditional mercury thermometers) is indeed the first option, but it's worth noting that many Celsius thermometers available today do not contain mercury.
So, while the first option is a valid concern for some types of thermometers, it might not apply universally to all Celsius thermometers. Thank you for prompting a closer look!