Bluetooth is changing small-area networking into a wireless and automatic connection with no need for user intervention and low need of transmission power.

A．have increased the risks to child growth by manipulating the natural environment
B．are increasingly aware of the effects of environmental factors on intelligence development
C．are increasingly interested in figuring out how intelligence is developed in early child- hood
D．are increasingly interested in manipulating the environment without being aware of the risks involved to children

A．the natural development of children's intelligence
B．early intervention in children's intellectual growth
C．providing enough day-care centers for children of working mothers
D．depriving poor mothers of the opportunities to raise their children at home