The man ______left leg broke in the match used to be a football player.
A. whose
B. who
C. whom
D. that
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He is an American astronaut ______ was the first man to set foot on the moon.
A. which
B. whom
C. whose
D. who
My sister, ______ is a teacher, always encourages me to study hard.
A. for whom
B. who
C. whose
D. whom
My sister always hits me, _____makes me unhappy.
A. as
B. who
C. which
D. for which
从外部来看,地理信息系统表现为计算机 ,其内涵却是由组成的地理空间信息模型,是一个逻辑缩小的、高度信息化的地理系统。