问题
单项选择题 A1/A2型题
结核病的发病机制错误的是（）
A.再次感染后局部病变轻微
B.结核菌首次侵入人体后可导致变态反应
C.初次感染可出现肺门淋巴结肿大和全身播散
D.结核病的免疫主要是细胞免疫
E.再感染和初次感染机体出现不同反应
答案
参考答案：A
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结核病的发病机制错误的是（）
A.再次感染后局部病变轻微
B.结核菌首次侵入人体后可导致变态反应
C.初次感染可出现肺门淋巴结肿大和全身播散
D.结核病的免疫主要是细胞免疫
E.再感染和初次感染机体出现不同反应
参考答案：A
Last summer Tom and his friends George and Bill wanted to take a vacation, but they did not have much . They decided that a short mountain climbing expedition(探险) was the only they could afford (负担得起). Since each of them liked climbing, the vacation would be a lot of . Tom all the plans. He decided that they should the expenses(费用) for food and gas and that each one should bring some _____ clothes because the weather there was usually cold. The boys were in a hurry, so they climbed slowly the day. The weather was pleasant, and they enjoyed the fresh as they climbed up a narrow path. Tom expected the to stay nice, late in the afternoon there was a heavy rain. The boys rushed toward a and decided to camp there that . When the sun rose the next morning, they continued . As the boys went higher, the climbing became dangerous, and by that afternoon the trip appeared . When they finally reached the of the mountain, they saw a beautiful sight. The of the sunset were yellow, red, and gold. The boys were very happy and they enjoyed the view. The farms and fields of wheat and corn appeared very small. In the distance, they could see trees, hills and valleys. They spent four more days in the mountains. They really had great fun.
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