The immune system is compared to a library.
举一反三
- Which IS the largest public library in the United States A: The Library of Congress. B: The Harvard University Library. C: The Chicago Public Library. D: The New York Public Library.
- Which of the following system works together with the immune system?
- ______ in the library is an important part of college life. You should______ the library.
- Who was Alexander Boyd A: The person who designed the library building. B: The author of several books in the library. C: The first director of the library. D: The biology professor after whom the library is named.
- Your immune system protects against many______ agents. (infect)