One Question per Day (2016.10.1)

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Salute to the chemical industry workers who remain at their posts and work hard in HaiChuan during National Day! Wish everyone a happy holiday! A reward of 20 wealth points for replying – I’m giving everyone some money as a holiday gift, limited to floor 40! Thank you for participating! While workers at a paper mill were repairing a pulp storage tank that had been out of use for over a month, a pipe broke and pulp sprayed out from it. After the pump was turned off, worker Li XX climbed down into the tank using a ladder to carry out repairs, but suddenly fell inside. Zhang XX thought that Li XX had been electrocuted, so he cut off the power supply and went down to rescue him, only to fall into the tank as well. After analysis, it was determined that the substance was toxic; immediately, air was blown in using a fan. Then the other three people entered the pool one after another. All three experienced a bitter and burning sensation in their throats as well as difficulty breathing, and they fell into the pool one after another. To prevent such poisoning, it is most important to provide workers with ____ A. education on safety and hygiene practices B. health checks before starting work C. regular health checks D. the use of gas masks. The correct answer is: A