单项选择题

A．They aren’t sure how these cells work.
B．They have difficulty identifying these cells.
C．They’ve found similar cells in other species.
D．They’ve learned how to reproduce these cells.
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单项选择题
A．It was more respected:B．More people used it.C．It was damaged by tourists again.D．It quickly got worse again after Lincoln’s death.
A．It was more respected:
B．More people used it.
C．It was damaged by tourists again.
D．It quickly got worse again after Lincoln’s death.
填空题
M
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