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单选题
When our guests step into our home, should we ask them to remove their shoes? Are bacteria(细菌) on shoes something we should really be worried about in our homes? An average shoe harbors thousands of bacteria per square inch. The bottoms of our shoes are essentially a meet-and-greet place for these bacteria, and with each step we take, we pick up new ones. Wherever we go, we’re going to be picking them up. While many types of bacteria are harmless to humans, some can cause severe diseases such as skin infections, and infections of the blood and the heart. But despite the horrifying picture, there is nothing serious to worry about. While many of us might want to clean the house at the thought of shoes, the reality is that the load of bacteria that our shoes bring indoors isn’t typically high enough to make a healthy person sick. Another point is that most of us don’t spend a lot of time on the floor, where bacteria stay. If you’re not exposed to them, you will not get sick from them. In some cases, layers of bacteria coating the floor can enter the air we breathe, lifted by the wind from a window. That might increase the risk of infection. But the greatest threat really lies in the floor. We should be more worried about a child crawling around on the floor. For a healthy adult, it’s not so big an issue. For the average household, bacteria on shoes don’t have an immediate risk. Healthy bacteria keep us healthy and protect us from other bacteria that can cause us sickness. For most healthy persons, however, we can make the decision to take our outdoor shoes off based on our preference and habit.
Which of the following is not the severe diseases caused by some bacteria?
A
B
C
D
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答案：
解析：
根据文章内容，有些细菌会导致严重疾病，如皮肤感染、血液感染和心脏感染。然而，头痛和胃痛并没有被提及为细菌引起的严重疾病。因此，选项B是不正确的，其他选项A、C、D都在文章中有提到。
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