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  3. For those people who go out in search of adventure, a longdistance flight in a hotair balloon is a particularly exciting prospec

For those people who go out in search of adventure, a longdistance flight in a hotair balloon is a particularly exciting prospec

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问题 For those people who go out in search of adventure, a longdistance flight in a hotair balloon is a particularly exciting prospect. Indeed, a roundtheworld balloon trip is widely regarded as the【S1】______challenge. One wellknown adventurer, David HemplemannAdams would not【S2】______, however. Recently, he became the first man to reach the North Pole in a hotair balloon, a more significant【S3】______in his eyes. Given that the distance and altitudes involved are comparatively【S4】______, you might wonder why the trip from Canada to the Pole, should present such a challenge.
    Part of the【S5】______was that such a flight had not even been at tempted for over a century. In those days, such expeditions were【S6】______events, with a nation’s pride resting on their success, and so resources were committed to them. Although he eventually managed to【S7】______a substantial sponsorship deal from an insurance company, HemplemannAdams had the added challenge of having to raise sufficient funds for his trip.
    Then, of course, he bad to face major survival concerns, such as predicting the weather conditions and coping with the【S8】______low temperatures. But most challenging of all was the incredibly complex problem of navigation. As the earth’s magnetic field gets stronger, only the most sophisticated of satellitelinked navigation systems can【S9】______that one has got to the Pole. Without them, the chances of getting anywhere near it am extremely【S10】______. Not to mention an even greater problem that weighed on HemplemannAdams’ mind: getting back!

A doubt             B modest                C huge              D dangerously
E agree             F secure                G strong            H pleasantly
I confirm           J ultimate              K slim              L failure
M achievement       N appeal                O difficult
【S2】
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