填空题

5（）

【参考答案】

hospitals
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单项选择题
The fossil of a baby dinosaur in the skeleton of R.robustus indicates that（）

A．R.robustus must have died in its pregnancy.
B．this mammal could have died while fighting with dinosaurs.
C．R.robustus swallowed the baby dinosaur as its food.
D．mammals would eat their young when starved.
单项选择题
22（）

A．perspective
B．trade
C．business
D．skill
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