问题
单项选择题 A1/A2型题
具有过敏毒素作用的是（）。
A.C3b、C4b
B.C1q
C.C1～C9
D.C3a、C4a、C5a
E.C2b
答案
参考答案：D
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具有过敏毒素作用的是（）。
A.C3b、C4b
B.C1q
C.C1～C9
D.C3a、C4a、C5a
E.C2b
参考答案：D
 A shopkeeper sent his son to learn about the secret of happiness. The boy wandered through the wilds for many days. He ____ reached a beautiful castle, where a wise man lived. Entering the ____， the boy saw the wise man talking with some people listening ____. It was two hours before it was his ____. The boy explained why he had come. The wise man suggested that the boy ____ and return in two hours. “Meanwhile, I want you to do something”， said the wise man, handing the boy a spoon that held two drops of ____. “As you walk around, carry this spoon without allowing the oil to spill (溢出)．” The boy began ___ up and down many stairs, keeping his eyes fixed on the ____. After two hours, he returned to the room where the wise man was. The wise man asked, “Did you see the Persian tapestries (壁毯) ____ in my dining hall? Did you see the ____ that took a master gardener ten years to build？” The boy was ___， and admitted that he had observed nothing. His only ____ was not to spill the oil he was given. “Go back and observe the marvels of my world”， said the wise man. “You cannot ____ a man if you know nothing about his house.” Relieved, the boy picked up the spoon and ____ his exploration again. This time he observed all the ____ of art on the ceilings and the walls. Upon returning, he related ____ everything he had seen. “But where are the drops of oil I had given to you？” asked the wise man. Looking down at the spoon he ____， the boy saw that the oil was ____. “Well, there is only one piece of ____ I can give you”， said the wise man. “The secret of happiness is to ____ all the marvels of the world and never to forget the drops of oil on the spoon.”
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