Montags and Clarisse's realtionship is weird. If she had not died I think they would have become a lot closer throughout the book. Clarisse seemed to bring out a different side of Montag. They way she would ask him questions and make things for him.
JKS stands for Java KeyStore. It is a repository of certificates (signed public keys) and [private] keys. You can export a certificate stored in a JKS file into a certificate file. You can use the keytool utility found in Java distributions to maintain your JKS trust and key repositories.
JK is the designation for Jeep Wranglers model year 2007 - present. Before that there was the TJ (1997-2006) and before that the YJ (1988 - 1995). Considering just the JK or Wranglers in general I'd answer the same way though. IMHO, the 2014 is the best year to buy (and I guess 2015 if they're available yet).