学生的学习要以间接经验为主，以直接经验为_______________。
参考答案：基础
—I have booked my ticket back to Washington. My flight leaves at 9:00 tomorrow morning.
—_______.[ ]
A. Is that so?
B. How wonderful!
C. Have a good trip.
D. Well, goodbye.
失语症最常见病因是（）
A.脑血管病变
B.脑组织炎症
C.脑外伤
D.脑肿瘤
E.Pick病
