单项选择题
Dubai is the capital of the United Arab Emirates, one of the world's leading（）oil producers.
A．raw B．crude C．rough D．primitive
单项选择题 I caught the last bus from town, but Tom came home（）than I.
单项选择题 The man was left（）in the empty land, but he was not lost.
单项选择题 The twins are so（）that I cannot tell them apart.
