单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．They have difficulty identifying these cells.
B．They’ve found similar cells in other species.
C．They’ve learned how to reproduce these cells.
D．They aren’t sure how these cells work.
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填空题
Obese children and adolescents have poorer health, as they are reported to have unhealthy ______.
单项选择题
A．They chased the bear away.B．They climbed up a tree.C．They stayed outside the tent and did nothing.D．They put some honey outside for the bear to eat.
A．They chased the bear away.
B．They climbed up a tree.
C．They stayed outside the tent and did nothing.
D．They put some honey outside for the bear to eat.
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