雅丹地貌以（）等最为典型。
A.新疆罗布泊
B.甘肃敦煌月牙泉
C.乌尔禾风城
D.宁夏中卫的沙坡头
参考答案：A, C
你知道下列单词的反义词吗？
big __________ long __________ left __________ in __________ he __________
The crowd ________ eastward, believing that they can find gold there.
A．are headed
B．is headed
C．heads
D．are heading
