The correct sentence is the second one "She built a high-performance CPU".
The first sentence should not contain a comma and is incorrect. The third sentence is incorrect because there shouldn't be a dash before CPU. The fourth sentence is incorrect because CPU is not written with dashes.
Pig-headed :) hope that helped!!
'Jim and Susan McDougal' were partners with the Clintons in the Whitewater Development Corporation. The purpose of this failed business was to develop vacation properties of 230 acres of land in Arkansas.
C. The witches' prophecy about macbeths future
false is the correct answer i think