We were arguing about the financial matter, ______ the telephone rang unexpectedly.

A．red little wooden
B．little red wooden
C．wooden little red
D．red wooden little

A．The position of the sun and the moon.
B．The mass of the moon.
C．The wind.
D．All of the above mentioned factors.

A．can change the working conditions for the operators
B．can limit the dangers from the electro-magnetic radiation
C．can also affect the growth of the cells
D．can protect the health of the computer operators