问题
单项选择题 A1/A2型题
目前发现的螺杆菌属的细菌至少有（）
A.2个种
B.6个种
C.3个种
D.5个种
E.9个种
答案
参考答案：E
解析：螺杆菌属至少有9个种，代表菌种是幽门螺杆菌。
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目前发现的螺杆菌属的细菌至少有（）
A.2个种
B.6个种
C.3个种
D.5个种
E.9个种
参考答案：E
解析：螺杆菌属至少有9个种，代表菌种是幽门螺杆菌。
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| Once there was an old farmer, with a horse which was almost as old as himself. He 1 one morning with his young son 2 the horse before it died. Father and son walked, 3 the farmer did not want the horse to be 4 . They met two men on the road 5 said:"Why are you walking, farmer? You have a horse. It's 6 to market." The farmer knew that this was 7 , so he rode on the horse, 8 his son walked. Then they met two old ladies." 9 are you doing up there, farmer? Can't you 10 how tired your boy is?" 11 the farmer got down, and his son rode 12 . 13 , three old men stopped them. One said:"Why are you walking, farmer? 14 . It's too hot for an old man like you to walk today." So the farmer got up 15 his son, and they 16 . 17 , a young woman passed them. "Why aren't you walking?" she asked."It isn't 18 to market. Give your poor old horse a rest." So the farmer, and his son, got down 19 . It is a fact that you cannot please 20 the people all the time. | ||||
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