----How amazing it it that astronauts are exploring outer space!
问题描述：
----How amazing it it that astronauts are exploring outer space!
— It’s a challenge,I guess,______ man against nature.
A.of
B.for
C.by
D.about
Helping others is a habit,______ you can learn even at an early age.
A.it
B.that
C.what
D.one
答
1.A. of是对的.
I guess 是干扰成分,用来增加题目的难度.其实它是个插入语,去掉它你就明白了：It's a chanllenge of man against nature.意思是,“人类征服自然的一种挑战.”a challenge of.,名词所有格,“.的挑战”,其它三个选项都不对.
2,D.one 是对的.
这里的one是做a habit的同位语,后面紧跟着一个省略了关系代词的定语从句 you can learn even at an early age,修饰one.这类题目经常出现在高考的考卷中.
总结：理清句子的结构是解答本题的关键.
【俊狼猎英】团队为您解答.