(1) As a result of Karen’s accident anyone using dimethyl mercury must now wear

a pair of gloves with a built-in computer chip that is connected to an alarm

a special protective suit as well as protective gloves

a pair of highly resistant gloves with many layers

two pairs of highly resistant gloves

(2) The first symptoms of Karen’s poisoning were

the inability to walk or speak properly

the inability to see or hear

the inability to think clearly

the inability to sleep well

(3) Karen’s accident occurred

when she was doing an experiment in her laboratory

when she was trying to repair a leak in some apparatus

when she was doing a demonstration in front of her students

when she was helping a colleague

(4) Before Karen’s accident

only a few people knew that dimethyl mercury could instantly penetrate rubber

most people knew that dimethyl mercury could instantly penetrate rubber

no one knew that dimethyl mercury could instantly penetrate rubber

only the suppliers knew that dimethyl mercury could instantly penetrate rubber