单项选择题

A．Very happy.
B．Greatly surprised.
C．Rather disappointed.
D．Very angry.
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单项选择题
A．102B．103C．201D．not sure
A．102
B．103
C．201
D．not sure
填空题
He expects an exotic study with freshwater worm from the Antarctic which can ______ to yield results which will help to understand how mirror-image twins develop.
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