经验证明不高于____ V的电压对人体是安全的．

已知25℃、101kPa下，如图所示，石墨的燃烧热为393.5kJ/

mol，金刚石的燃烧热为395.0kJ/mol．下列说法或表达正确的是

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启蒙运动中，一生致力于抨击封建专制制度和天主教会，倡导自然权利学说，成为启蒙运动的巨匠的是(    )

完形填空

　The  1  is getting colder, and soon winter  2  shorter. We live in warm houses and we  3  thick coats when we go outside. But 4  do animals stay warm in winter?

Adapt(适应)

    Some animals keep  5  in winter, so they must adapt to the changing weather.  6  warm, they may grow new, thicker fur in  7 autumn.

Migrate(迁徙)

    Some of the animals migrate. That means they travel to other places  8  the weather is warm or they can find food.

Hibernate(冬眠)

    Some animals hibernate for part or  9  of the winter. These animals usually find a cave or a hole under the ground to spend their winter. The body temperature of the animals drops, their heart beats more slowly and they breathe  10  .

面积是____ $c{m}^2$ .