问题
单项选择题
空泡现象是指液体的环境压力（）于对应条件下的饱和蒸汽压力，出现的液体“汽化”。在船舶领域主要指推进螺旋桨旋转运动时在（）局部产生的水分子空泡现象。
A.高；桨轴
B.高；桨叶
C.低；桨轴
D.低；桨叶
答案
参考答案：D
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空泡现象是指液体的环境压力（）于对应条件下的饱和蒸汽压力，出现的液体“汽化”。在船舶领域主要指推进螺旋桨旋转运动时在（）局部产生的水分子空泡现象。
A.高；桨轴
B.高；桨叶
C.低；桨轴
D.低；桨叶
参考答案：D
One of the warmest Christmas memories that I have was the year that I was Santa Claus.I was a young substitute(替代者)for a ____with a new family just starting out in life.I was ____ to work at the local grade school on the last day ____ the Christmas holidays. I can still ____ going from classroom to classroom and doing my best to____both old and joyful at the same time.I was about 50 pounds heavier then，____I had the round little belly part down fine.My beard，however，was another ____as it kept sliding halfway down my face.I thought that more than a few of the kids ____me，but it didn't matter.They still enjoyed ____ Santa.They still laughed and delighted in their__45__gifts and candy canes.They still felt joyous and happy.They still knew that they were____and that was all that mattered to them. If there is one____that I could give to each of you at Christmas time and____day of the year，it would be that knowledge that you are loved.You are loved and ____by a greater love than you could ever imagine.You are loved by God who____you.In all the difficulties，problems，and heartaches this world ____，you are loved.In all the obstacles you must overcome，challenges you must ____，and pains you must go through，you are loved.In all the mistakes you make，times you stumble(绊倒)，and___ paths you take，you are loved.You are loved every second in your life with a glorious love that will ____end. Know that you are loved.Know that God loves you always.Rejoice(欣喜)in this love with the ____heart of a child.And then，like a jolly(欢乐的)laughing Santa，go out and share it with the world.
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