单项选择题

A．A short period of fair weather and mild days.
B．No definite time of beginning or ending.
C．Its end signals winter’’s start.
D．Soft yellow or orange skies.
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单项选择题
What do we know about Mark from the passage
A．Mark has been transferred to another job because of his poor work.
B．Mark prefers credit to his own interest.
C．Mark has pleasant personality and plays a key role in the office.
D．Mark will have a very promising future career.
单项选择题
A．They have difficulty identifying these cells.B．They aren’’t sure how these cells work.C．They’’ve learned how to reproduce these cells.D．They’’ve found similar cells in other species.
A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
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