The process in which cartilage is replaced by bone is called what? ()
A. Synovial fluid
B. Ossification
Compact bone
D. Fracture
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5.According to the author, a born naturalist should first of all be ________.
A. full of ambition
B. full of enthusiasm
C. knowledgeable
D. self-disciplined
4.The author says that he is a naturalist rather than a scientist probably because he thinks he ________.
A. lacks some of the qualities required of a scientist
B. has a great deal of trouble doing mental arithmetic
C. just reads about other people’s observations and discoveries
D. comes up with solutions in a most natural way
3.It can be inferred from the passage that the author was ________.
A. no more than a born naturalist
B. a naturalist but not a scientist
C. a scientist as well as a naturalist
D. first of all a scientist
2.The author can’t remember his relatives clearly because ________.
A. he didn’t live very long with them
B. he was fully occupied with observing nature
C. he was too young when he lived with them
D. the family was extremely large
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