They decided to chase the wounded deer as far north（）the border.

A．Because it is extremely dangerous to conduct such research on an airplane,
B．Because it remains a mystery what wavelengths are liable to be interfered with.
C．Because research scientists have not been able to produce the same effects in labs.
D．Because experts lack adequate equipment to do such researc

A．after the installation of a great number of cells and connections, robots will be capable of self-reproduction
B．with the rapid development of technology, people have come to realize the possibility of making a machine with human-like ability
C．once we make machine as complex as the human brain, it will possess intelligence
D．robots will have control of the vast, man-made world in space