单项选择题


Questions 25 and 26 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now listen to the news.
Which is NOT correct description about Medullary bone

A．Medullary bone is only known in ovulating birds before.
B．It is full of calcium.
C．Birds draw calcium in it to make shells for their eggs.
D．A dinosaur doesn’t have medullary bone.
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单项选择题
What will the college students do for the high school students
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B．Teach classes at their high school.
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B．Kraft has been being up against to be responsible for its potentially unhealthy foods.
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D．Kraft could not make advertisements again.
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