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资料题:When the sun is halfway across the sky, it is( )。

发布时间:2021-02-18

A.rising in the east

B.setting in the west

C.over our head

D.the sun at 8 or 9 in the morning

参考资料

Sometimes we can find our way with the sum.Perhaps birds and animals do the same.They don't have clocks like our clocks.But their bodies can tell them the time.These body-clocks can say to the animals,“There's half-a-day more of daylight.The sun is up there.So home is over there.”Their body-clocks are never wrong.Sometimes days are long and hot.Sometimes they're short and cold.But the body-clocks of animals and birds are always right.Sometimes it rains and we don't see the sun all day.Ir's behind gray clouds so we can't see it.Sunlight still comes through the clouds, but the clouds change the light.Sunlight through clouds is polarized light (偏振光).Men can't see polarized light, but some animals can see it.To our eyes, all light is the same.On a day of cloud, our eyes tell us, "It's daytime" .But where is the sun in the sky? We don't know.Some animals know.They look at the same sky and the polarized light tells them,“It's daytime, and the sun is halfway across the sky".These animals know the place of the sun behind the clouds.They can read is path across the sky.So they can find their way on days of cloud.

试卷相关题目

  • 1We can not tell polarized light from( )。

    A.natural lightfrom the sun

    B.the light from the moon

    C.the light given by the stars

    D.any other light

    开始考试点击查看答案
  • 2Which of the following statement is NOT true( )。

    A.We call sunlight through clouds polarized light

    B.Only part of sunlight can reach the earth

    C.Polarized light can also be called one way light

    D.All animals can see polarized light as well as men

    开始考试点击查看答案
  • 3The body-clocks of animals and birds can( )。

    A.always tell them the correct time

    B.sometimes tell them the wrong time

    C.never tell them daytime

    D.often tell them whatis right and what is wrong

    开始考试点击查看答案
  • 4"Perhaps birds and animals do the same" means that they perhaps( )。

    A.have clocks like mechanic clocks

    B.can also find their way with the sun

    C.know the time with the help of our clocks

    D.also work hard

    开始考试点击查看答案
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