Great as Newton was, many of his ideas ____ today and are being modified by the work of scientists of our time.
A、aretochallengeC
【句意】尽管牛顿非常伟大，然而他的许多观点当前正受到怀疑，并且当今的许多科学家正在努力对这些观点进行修正。
【难点】challenge意为“挑战，怀疑”，常用作及物动词。本句中牛顿的观点受到挑战为一个当前已经发生的事实，故采用现在完成时的被动语态。
Is Tom at school today?No, He ’s at home ______ he has a bad cold.
汉译英：流逝，表现了南国人对时间最早的感觉。“子在川上曰，逝者如斯夫。”他们发现无论是潺潺小溪，还是浩荡大河，都一去不复返，流逝之际青年变成了老翁而绿草转眼就枯黄，很自然有错阴的紧迫感。 流逝也许是缓慢的，但无论如何缓慢，对流逝的恐惧使人们必须用“流逝”这个词来时时警戒后人， 必须急匆匆地行动，给这个词灌注一种紧张感。
It is necessary that the students ____ more excercises to do.
I’veneverbeenoutofChina___________.Whataboutyou?
The local government leaders are making every effort to __ the problem of poverty.
