单项选择题
The earth,（）is the fifth largest planet in the solar system, is the third planet from the sun.
A．who B．whom C．which D．that
单项选择题 We've tested three hundred types of boots, none of（）is completely waterproof.
单项选择题 All（）is needed is a continuous supply of fuel oil.
单项选择题 The award was won by Dennis Johnson,（）the coach highly respects.
