1 . 他们也不能想象出那里的当地物种，包括帝企鹅、王企鹅和象海豹，数千年来是如何与它们的自然栖息地和谐共存的。
________________ how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural habitat for thousands of years.

2 . 他们也不难想象出，数千年来，当地动物是如何与其自然栖息地完美地和谐共存的。(否定副词位于句首引起的倒装)(汉译英)

3 . _______ the answer to such an easy question!

A．Imagine not to know

B．Imagine not knowing

C．Imagine not know

D．Imagine knowing not