单项选择题

The ingredient of atmosphere does NOT include ______.

A．carbon dioxide
B．dust particles
C．water vapor
D．sunlight
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单项选择题
Why had nearly a million people come to watch the launch of Apollo 11
A．They had come to intensify the excitement.
B．They just wanted to show their support for the national project.
C．It was mankind’s first attempt to land on the moon and no one wanted to miss the historic event.
D．They didn't believe the mission would succeed.
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.
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