One of the things the author talks about but does not speak highly of is the usual ______.

A．Non-invasive scanners, teleconferencing and Internet will become the only tools in diagnostics.
B．People can recover from their diseases by changing their lifestyle.
C．Fatal diseases brought by genetic anomalies can be avoided by using biochips.
D．Individual adverse reactions to certain drugs are predetermined by genes.

A．modern forms of transportation bring people from different places into contact very quickly
B．the diseases are not spotted quickly enough
C．finding a vaccine against this disease would be difficult
D．people are not immune to diseases from another geographical area