If you are writing or studying, it makes much difference where the light comes from. People     use   46   and pens every day. They have to be very careful about the way of the light because the light shines on their work.
Every  47   gets its light either from daylight   48   the window   49   from the lamps or electricity,   50   no matter what kind of light it is, the way it shines towards our books or work is very important to the eyes.
Take a book and sit with your   51   toward the window, and try to read. Your shadow(影子) falls all over the page and makes it   52   for your eyes as if you were in a   53   room.
Now turn around and face the window. The page is   54   shadow again, while the bright light is in your eyes.
Try sitting with your   55   side toward the window. This is very good for   56   , but if you were writing, the shadow   57   fall across the page and bother you  58   .
There is another way – sit  59   your left side to the window. Now everything is perfect for writing as well.
Whatever kind of light is in the room, the rule about the right way to sit is   60   the same.

A．eyes B．heads C．books D．hands

A．man B．woman C．house D．animals

A．from B．through C．into D．inside

A．and B．then C．as D．or

A．but B．until C．if D．when

A．side B．back C．body D．front

A．good B．bad C．useful D．clear

A．bright B．clean C．dirty D．dark

A．in B．into C．on D．to

A．front B．back C．left D．right

A．speaking B．reading C．writing D．studying

A．can B．may C．would D．will

A．few B．a few C．little D．a little

A．by B．with C．against D．near

A．only B．never C．not often D．always