21.A 推理判断题。根据第四段…scientists have become increasingly confident they will find Martian life forms.Europe and America's robot explorers have found proof that water, mixed with soil, exists in large amounts on the planet.的内容,我们知道科学家越来越相信火星上存在生命,因为有证据表明火星土壤中存在大量的水,故可断定水是生命存在的关键要素。
22.B 推理判断题。根据倒数第二段…The gas is a waste product of living creatures and could be produced by microbes living in the red planet's soil.可知,火星大气层中存在甲烷的迹象,而甲烷是活着的动物产生的废物,据此科学家推断这可能是生活在火星上的微生物产生的。故可得出结论:火星上可能存在微生物,主要证据是在火星大气层中发现了甲烷的迹象。
Ⅲ.Time and tide wait
no man. My mother is becoming a
woman quietly. She
been busy running after us all the years. My father is very busy every day outside.
the heavy burden falls on my mother’s
. Because my school is far from my home, I have to go to school by the/ train and my mother sees me off at the station every time. I often choose a seat
is close to the window, so I can see her.However, I always can’t help
tears from my eyes. All the buildings and people outside the window disappear. I wave
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