与遗传因素密切相关的是
A．弥漫型(胃型)胃癌B．食管腺癌C．胃黏膜相关淋巴组织淋巴瘤D．结肠癌E．胃息肉
参考答案：D
Work hard ____________ sports. [ ]
A. at
B. on
—What does his mother look like?
—_____． [ ]
A. She's a doctor
B. She's forty
C. She's thin
D. She works in a bank
