在美国期间,钱学森仅仅为了解决一道薄壳变形的难题,研究的手稿就累积了厚厚一大摞,在工作进展到五百多页部分,他的自我感觉是:“不满意!!!”直到八百多页时,才长舒一口气。他把手稿装进牛皮纸信封,在外面标明“最后定稿”,继而觉得不妥,又在旁边添上一句:“在科学上没有最后!”这表明
﹣Our computer is working again!
﹣Yes.Our IT teacher it.It took him about an hour.
A.has fixedB.will fixC.is fixingD.was fixing
Every student is suppose to a sporting activity for a healthy life.
A.come acrossB.put away
C.turn downD.take up
一Have you ever heard"A thousand mile journey begins with the first "?
一Yes,It's a famous Chinese saying by Laozi.
A.classB.stepC.breakD.exam
Our country has made great progress in the fight blue skies and clear waters.
A.inB.forC.againstD.between
一The Chinese language is more and more popular.
一Exactly!It's becoming language skill in the international community.
A.similarB.difficult
C.necessaryD.traditional