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【参考答案】

∧ created—are
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单项选择题
Which of the following is mentioned as an improvement on the launch of Discovery
A．a special examination of the O ring
B．greater safety design of the crew cabin
C．redesign of the booster system
D．careful consideration of the effects of weather
单项选择题
The mainstream animal-welfare activists would agree that ______.
A．all animals are morally equal
B．all animals should have the same rights as human beings
C．all animals are not morally equal
D．some animals must have exact the same rights as humans
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