I am writing to express my interest in your current opening for a summer internship position with Domestic Sales. I have enclosed my resume to provide a summary of my qualifications and background for your review.

I am currently double majoring in International Relations and Economics at the University of ABC and will receive my degree this fall. Through my studies, I have not only gained extensive understanding of politics and the global economy, but also honed such essential skills as presenting, analyzing, and critical thinking to a professional level.

I am active, passionate, and constantly searching for challenging experiences to give me a deeper understanding of the world. I am extremely self disciplined and learn rapidly. As a result of my thirst for knowledge combined with my immense interest in linguistics, I have mastered a number of foreign languages including English, French, Japanese, and Russian, entirely by self-study.

As an I am soon to be entering the business world, I’m eager to start my career by working as an intern for the renowned aluminum manufacturing firm, XYZ. Given my focus on the financial domain and my global mindset, I am certain that I will make great contributions to the domestic sales department.

The resume enclosed will provide you with greater details of my experiences and qualifications.

Thank you for your time and consideration.

intimate acquaintance – intimate is not a term you should generally use in business contexts, especially in conjunction with acquaintance. It can be correct, but the most common use of "intimate acquaintance" is to describe a person with whom you are in a physical relationship.

This cover letter sounds extremely arrogant, but a lot of companies like self-aggrandizement, so it should be fine. 

Good luck.