单项选择题

What is the government laboratory trying to do

A．Collect ash tree seeds for experiment.
B．Preserve the healthy ash tree seeds.
C．Set up a new seed bank for research.
D．Develop a new breed of ash tree.
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walking
单项选择题
A．Not to subscribe to the journal.B．To buy the latest issue of the journal.C．Not to miss any brilliant papers.D．To photocopy the papers in the journal.
A．Not to subscribe to the journal.
B．To buy the latest issue of the journal.
C．Not to miss any brilliant papers.
D．To photocopy the papers in the journal.
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