By saying "Normal e-mail is an unsecured system" (Line 3, Para.9), the author suggests that banks do not ______ e-mail system.

A．He wants to quit the class too.
B．He knows nothing about swimming.
C．He made great efforts in learning to swim.
D．He teaches swimming.

A．There has been an increase in the number of jobs advertised.
B．There has been an increase in the number of applicants with degrees.
C．Jobs axe becoming much more complicated nowadays.
D．The other processes of applying for jobs axe more complicated.