在气动控制中，常用____控制气缸的运动速度，____控制气缸的运动方向。
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Choosetheanswerthatcorrectlyinterpretsthesentencefromthetext.And it was that compulsion, to bring a quarter of a ton of dark grey rock back home, that very nearly led to our undoing. (Para. 4)
A. We felt we must bring back the dark- grey rock samples weighing a quarter of a ton, and the urge to do that almost killed us all.
B. We had to bring back the quarter-ton of dark-grey rock, and that made the trip extremely dangerous and even impossible.
His boat was four miles away, lashed up against an ice floe, and as close to us as was possible. (Para. 6)
A. His boat was four miles away and could not come closer, because a big ice floe clogged its way.
B. His boat was four miles away, because a big ice floe had pushed it away from the shores.
… we would have to take our chances on the ice floes, and get to his boat by walking out. (Para. 7)
A. … we would have to take the risk of walking out on the ice floes to reach his boat.
B. …we would have to take the only opportunity and avoid the ice floes to get to the boat.
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