1 . 听下面一段独白，回答以下小题。
1. How do scientists at University College London measure memory loss?

A．By recording the time people spend on TV.

B．By tracking people's living habits.

C．By using memory and fluency tests.

2. What leads to memory decline in older people?

A．Watching television for hours.

B．Playing video games for hours.

C．Surfing the Internet for hours.

3. What do the researchers suggest older people do?

A．Make more friends.

B．Sleep eight to ten hours per night.

C．Balance TV viewing with other activities.