Researcher Kep Kee Loh said：“Media multi­tasking is becoming more prevalent in our lives today and there is increasing concern about its impacts on our cognition and social­emotional well­being.” “He added that more research is needed to prove that multi­tasking shrinks the brain. This is because it is also possible that people with less grey matter in the ACC are more drawn to using lots of gadgets simultaneously.” Experts have also warned of the harmful impact technology can have on our memory and attention span. The University of California team commissioned a survey of more than 18,000 people aged between 18 and 99 and found 20 percent had problems with memory. Researchers were taken aback by the 14 percent of 18 to 39­year­olds who also worried about their memories.

　　Multi­tasking with gadgets may shorten attention span, making it harder to focus and form memories, the researchers said, adding that youngsters may be particularly affected by stress.

　　1．What's the main idea of this passage?

　　A．Multi­tasking shortens attention span.

　　B．Multi­tasking makes your brain smaller.

　　C．Multi­tasking has harmful effects on our memory.

　　D．Multi­tasking is becoming more and more popular.

　　2．What does the underlined word “simultaneously” (in Paragraph 3) mean?

　　A．frequently B．now and then

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