题干
37.________________certain that his invention will lead to the development of production.
A：That's
B：This is
C：It's
D：What'
答案(点此获取答案解析）
C
A：That's
B：This is
C：It's
D：What'
为定
义在R上的奇函数，当
时，
（
为常数)，则
