--Steven has got the first prize in the math contest. he looks so happy today.A. There’

--Steven has got the first prize in the math contest.
-- he looks so happy today.
A. There’s no doubt that
B. It’s no wonder that
C. Thisis no doubt whether
D. That is no wonder whether

A. There’s no doubt that(答案→)B. It’s no wonder thatC. Thisis no doubt whetherD. That is no wonder whether解析：考查固定句型：It’s no wonder that…难怪…,句意：--斯蒂芬在数学比赛中得了第一名，难怪他那么高兴。A.There’s no doubt that毫无疑问，不符合句意，选B。

我也是这个答案

这个答案应该是对的

B解析它的分子式应为S4N4；有1 mol的该物质的微粒中含有共价键为10NA；同位素是针对原子而言的。