anybody~~help me~~~~

0Hello~~02br
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00i'm a student who are studying English by myself.02br
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00I have had difficulties studying and reading an english article.02br
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00So i wanna sb to help me~:)02br
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00I'll ask some phrases, idiom, voca and sentences..02br
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00at first...02br
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00There are no shortage of 01font00photo call shots02font00 of the secretary general of UN.02br
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00Heightened security measures at major international hubs humiliate thousands on a daily basis and01font00 raise many flags02font00 concerning basic civil liberties.02br
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00As he's got a good five years to make an impression before his term is up, there's time to become a household name and live up to the job description. In case you're not quite sure what that is, the United Nations defines it as "equal parts diplomat and advocate, civil servant and CEO, the Secretary-General is a symbol of United Nations ideals, a spokesman for the interests of the world's peoples." 01font00A tall order if ever there was one but also a wonderful opportunity to communicate the activities of the United Nations' diverse and far-flung agencies02font02br
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00----->in this paragragh, i can't understand the blue sentence.02br
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00Many will be first-time travelers, many more will be unfamiliar with the changing landscape of 01font00what is supposed to pass for civil aviation.02font02br
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00It could be argued that the secretary general has better, more important things to be getting on with than worry about how people get from A to B and in what shape. I would argue that for a sector worth so much money,01font00 that02font00 is ultimately responsible for the patterns of human migration and is increasingly in the spotlight for the mistreatment of01font00 those it02font00 carries over land, sea and through the air, 01font00it02font00's not only necessary but urgent.02br
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00--->at here i don't know what each of "that" "those" "it" "it" indicates.02br
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00so many questions..02br
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00but i'll thank you to help me~:)02br
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