In my view, biology is ______ chemistry, but a little easier than mathematics.
| A．a subject so difficult as | B．as difficult a subject as |
| C．as a difficult subject as | D．difficult as a subject as |
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In my view, biology is ______ chemistry, but a little easier than mathematics.
| A．a subject so difficult as | B．as difficult a subject as |
| C．as a difficult subject as | D．difficult as a subject as |
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