问题
单项选择题
注射破伤风抗毒素属于（）
A.自动自然免疫
B.自动人工免疫
C.被动自然免疫
D.被动人工免疫
E.混合免疫
答案
参考答案：D
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注射破伤风抗毒素属于（）
A.自动自然免疫
B.自动人工免疫
C.被动自然免疫
D.被动人工免疫
E.混合免疫
参考答案：D
Long ago there was a poor farmer in Russia. He had been very__1__with everything he had. However，when he found his elder brother was_2__than him，he felt disappointed. So he__3_hard about how he could also be richer. Finally he got an idea. He started to spend less money on food and clothes to__4__some money to buy more land. Once he had enough money，he started__5_for land. He__6__that on the neighboring land，there were some nomads (游牧民) living there. He bought some gifts and went to__7__their head. He presented the gifts to the head and told him the__8__of his visit. The head welcomed him，accepted the gifts and agreed to his_9__to get the land. The head told him that he could have the land__10__giving him anything. He can take as much land as he could__11__by walking through the land before sunset (日落)．He should start in the morning and whatever distance he could travel during the__12_，he could have it. The farmer became very__13__when he heard this offer. Now he could have lots of__14__without paying anything. He came_15_the next morning and started running，not walking，__16__he could cover the largest area. To reach his goal，he neither ate food，nor drank water，nor had any rest. He just continued__17__.Without eating，or drinking，or resting he just got very__18__.When he came back to the head in the evening，he__19__right on the spot. Sadly his son buried him in a piece of land about 6 x 4 feet. Don’t be greedy (贪婪的) or you will__20__everything finally.
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