The girl _____ red is my sister. [ ]
A. in
B. on
C. ar
D. of
答案：A
___ is known to us all is ____ the sun is bigger than the earth.
A It; that B What ; that C What ; how D That; that
以下______估算技术可以使用原型法。
A．参数 B．外推C．类比 D．历史结果
