单项选择题

The destruction of natural vegetation has resulted from ______.

A．agricultural demands
B．stockbreeding demands
C．construction demands
D．all of above
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单项选择题
In the last paragraph why did the author use the word distant
A．Because they lived far from each other.
B．Because they worked in different departments.
C．Because they were indifferent to each other.
D．Because only three of them would participate in the operation.
单项选择题
Which of the following statements is NOT true according to the passage
A．The Apollo spacecraft was the most complex machine ever assembled.
B．The liftoff team had been evacuated from the spot several hours before the operation.
C．Hundreds of engineers and technicians were involved in the operation.
D．If all this machinery worked perfectly the operation would succeed definitely.
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