题目：
Shelly had prepared carefully for her biology examination so that she could be sure of passing it at her first .
A．intention
B．effort
C．attempt
D．sight
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：糖皮质激素可减少炎性渗出物，解除支气管痉挛，改善血管通透性，对缓解喘憋效果最好。
