单项选择题

We don’t imagine the twins have arrived, ______

A．do we
B．don’t we
C．have they
D．haven’t they
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单项选择题
What is the purpose of sending the probe to Mars
A．To compete with other countries in space.
B．To get a closer base for further exploration.
C．To prove India’s independence in space exploration.
D．To get more information about life on Mars.
单项选择题
______ in large part by the cold, dry climate, the fragment, which includes a canine tooth, still held some genetic remnants.
A．Preserving
B．Having been preserved
C．Having preserved
D．Which was preserved
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