单项选择题

Experts from the headquarters will be looking at our methods of production with a view to improving efficiency．

A．总部的专家将考察我们的生产方式，旨在提高我们的生产效率。
B．总部的专家为了提高效率将视察我们的生产方式。
C．从总部来的专家们将观察我们的生产方式，为的是提高我们的效率。
D．从总部来的专家们带着提高效率的观点，将要来观看我们的生产方法。
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单项选择题
What is known about the influenza virus
A．It was first found in a group of very old birds.
B．All the different strains can be found in wild birds.
C．It existed over 100 million years ago.
D．It can survive in many different places.
单项选择题
According to the passage, scientists have discovered that influenza viruses ______ .
A．cause ill health in wild birds
B．do not always cause symptoms in birds
C．are rarely present in wild birds
D．change when transferred from animals to man
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