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In January 2009, during the first weeks of a six-month stay at the Children’s Hospital of Philadelphia for leukemia (白血病) treatment, Michael wandered over to his hospital window in search of relaxation. The (36) first-grader watched a construction crew (37) on a 10-storey addition to the hospital. (38) Michael’s third-floor window, Ritchie, an iron-worker from the East Falls section of Philadelphia, (39) and saw "this kid with no hair (40) face was pressed up to the window. I waved, and he smiled and (41) . I’ll never forget that," says Ritchie, a father of three.As winter (42) spring, Michael watched, fascinated (着迷), as 3,000 tons of steel (43) formed the skeleton of the building. One day he colored a message for the crew and held (44) up to the window: Hi, Local Iron Workers. I’m Mike. Ritchie and the (45) crew messaged back. Over the (46) months, as his treatment continued, Ritchie and the crew (47) Michael up and cheered him with (48) signs like Be Strong Mike. (49) the construction reached the third floor, Ritchie jumped across the (50) between the buildings and the two had a (51) chat. The hard hat with the tender heart wells up (涌出眼泪) when he thinks about it. "Michael (52) my life," says Ritchie. "I was a real hard-core (顽固不化的) person without a lot of sympathy. But I’d (53) seeing this kid every day waving at me and excited about the construction. I look at life (54) thanks to him." Today Michael is a 10-year-old third-grader in complete recovery. What does he hope to (55) when he grows up "A construction worker," he says. 40().

A. whom
B. whose
C. which
D. that

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In January 2009, during the first weeks of a six-month stay at the Children’s Hospital of Philadelphia for leukemia (白血病) treatment, Michael wandered over to his hospital window in search of relaxation. The (36) first-grader watched a construction crew (37) on a 10-storey addition to the hospital. (38) Michael’s third-floor window, Ritchie, an iron-worker from the East Falls section of Philadelphia, (39) and saw "this kid with no hair (40) face was pressed up to the window. I waved, and he smiled and (41) . I’ll never forget that," says Ritchie, a father of three.As winter (42) spring, Michael watched, fascinated (着迷), as 3,000 tons of steel (43) formed the skeleton of the building. One day he colored a message for the crew and held (44) up to the window: Hi, Local Iron Workers. I’m Mike. Ritchie and the (45) crew messaged back. Over the (46) months, as his treatment continued, Ritchie and the crew (47) Michael up and cheered him with (48) signs like Be Strong Mike. (49) the construction reached the third floor, Ritchie jumped across the (50) between the buildings and the two had a (51) chat. The hard hat with the tender heart wells up (涌出眼泪) when he thinks about it. "Michael (52) my life," says Ritchie. "I was a real hard-core (顽固不化的) person without a lot of sympathy. But I’d (53) seeing this kid every day waving at me and excited about the construction. I look at life (54) thanks to him." Today Michael is a 10-year-old third-grader in complete recovery. What does he hope to (55) when he grows up "A construction worker," he says. 42().

A. went off
B. went out
C. turned into
D. turned to

在二氧化碳潴留之前,是因为

A. O2的弥散系数相当于CO2的21倍
B. O2的弥散系数相当于CO2的30倍
CO2的弥散系数相当于O2的21倍
D. CO2的弥散系数相当于O2的30倍
E. CO2与O2的弥散系数相等

Life is difficult. It is a great truth because once we truly understand and accept it, then life is no longer difficult. Most do not fully see this truth. Instead they complain about their problems and difficulties as if life should be easy. It seems to them that difficulties represent a special kind of suffering especially forced upon them or else upon their families, their class, or even their nations. What makes life difficult is that the process of facing and solving problems is a painful one. Problems, depending on their natures, cause us sadness or loneliness or regret or anger or fear. These are uncomfortable feelings, often as painful as any kind of physical pain. And since life causes endless serious problems, life is always difficult and is full of pain as well as joy. Yes, it is in this whole process of solving problems that life has its meaning. Problems are the serious tests that tell us success from failure. When we desire to encourage the growth of human spirit, we encourage the human ability to solve problems, just as in school we set problems for our children to resolve. It is through the pain of meeting and working out problems that we learn. As Benjamin Franklin said, "Those things that hurt, instruct." It is for this reason that wise people learn not to fear but to welcome the pain of problems. The saying from Benjamin Franklin "Those things that hurt, instruct" suggests that ______.

A. we do not learn from experience
B. we do not learn when we are in pain
C. pain teaches us important lessons
D. pain cannot be avoided

In January 2009, during the first weeks of a six-month stay at the Children’s Hospital of Philadelphia for leukemia (白血病) treatment, Michael wandered over to his hospital window in search of relaxation. The (36) first-grader watched a construction crew (37) on a 10-storey addition to the hospital. (38) Michael’s third-floor window, Ritchie, an iron-worker from the East Falls section of Philadelphia, (39) and saw "this kid with no hair (40) face was pressed up to the window. I waved, and he smiled and (41) . I’ll never forget that," says Ritchie, a father of three.As winter (42) spring, Michael watched, fascinated (着迷), as 3,000 tons of steel (43) formed the skeleton of the building. One day he colored a message for the crew and held (44) up to the window: Hi, Local Iron Workers. I’m Mike. Ritchie and the (45) crew messaged back. Over the (46) months, as his treatment continued, Ritchie and the crew (47) Michael up and cheered him with (48) signs like Be Strong Mike. (49) the construction reached the third floor, Ritchie jumped across the (50) between the buildings and the two had a (51) chat. The hard hat with the tender heart wells up (涌出眼泪) when he thinks about it. "Michael (52) my life," says Ritchie. "I was a real hard-core (顽固不化的) person without a lot of sympathy. But I’d (53) seeing this kid every day waving at me and excited about the construction. I look at life (54) thanks to him." Today Michael is a 10-year-old third-grader in complete recovery. What does he hope to (55) when he grows up "A construction worker," he says. 55().

A. have
B. get
C. be
D. appreciate

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