There may be life on Mars. We know more about Mars than about any other planets. But astronauts are still guessing about many things. For example, we think that on Mars there may be change of weather during the year. Our own weather changes from winter to summer, perhaps it is the same on Mars. In Mars’ mid-summer we can see brown places on the planet. In mid winter these places are white, so some scientists believe that plants grow on Mars during mid-summer and change color in winter. They are not sure if there are green fields on Mars. But perhaps there is some kind of life there.

根據(jù)短文內(nèi)容，判斷句子的正誤，正確的寫“A”，錯誤的寫“B”。

（    ）46、Human begins have more knowledge about Mars than any other planets.

（    ）47、It is certain that on Mars there are four seasons like on the earth.

（    ）48、It is true that color of Mars changes with the plants growing on Mars.

（    ）49、In Mars’ mid-summer we can see white places on the planet.  In

midwinter these places are brown.

（    ）50、Scientists guess that there may be life on mars.

46.（  A  ） 47.（ B    ） 48.（  B   ） 49.（   B  ） 50.（  A  ）

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