APT- if I apt-get -u upgrade to testing, will apt go backwards?

["J F" <j1234f@excite.com>]

If I apt-get -u upgrade to testing, will apt go backwards?
I don't want to, but the new knoppix hard disk
install has some unstables in the list below.
I'm assuming that apt-get -u upgrade with
my /etc/apt/apt.conf below won't go BACKwards in time
from packages installed as unstable back to testing???

Thanks,
JF

# more  /etc/apt/apt.conf
APT::Default-Release "testing";
APT::Cache-Limit 10000000;
Apt::Get::Purge;

# apt-show-versions -u -b
mozilla-browser/unstable
libnss3/unstable
kbounce/unstable
samba/unstable
libsdl1.2debian/testing
libsdl1.2debian-oss/testing
secpolicy/unstable
libmagick5.5.7/unstable
libtool/testing
xfonts-scalable 4.3.0-0ds4 newer than version in archive
...



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