A．To create artificial bone tissue.B．To learn how to prevent a bone disease.C．To find
A. To create artificial bone tissue.
B. To learn how to prevent a bone disease.
C. To find out how specialized bone cells have evolved.
D. To understand differences between bone tissue and other tissue.
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A．So that they are protected from scratches by the crane's talons.B．So that they aren'
A. So that they are protected from scratches by the crane's talons.
B. So that they aren't exposed to infectious diseases.
C. So that the chicks can be examined in a sterile environment.
D. So that the chicks don't become dependent on human being.
Nobody really knows the reason why we sleep.
A. Y
B. N
C. NG
A．Pay for the woman's football ticket.B．Find out how many points were scored.C．Wait un
A. Pay for the woman's football ticket.
B. Find out how many points were scored.
C. Wait until next month to see a game.
D. See the game in person.
听力原文：M: Let's go for a nice long walk in the country this morning.
W: I certainly would go with you, but I think I'm under the weather.
Q: What can we infer from the conversation？
(14)
A. Go walking with her friend.
B. Rest and take care of herself.
C. Stay at home and do her exercises.
D. Catch up with her reading.
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