胃阴枯竭的舌象是
A．淡红舌B．紫舌C．绛舌D．镜面舌E．鲜红舌
参考答案：D
Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge. [ ]
A. while
B. because
C. unless
D. if
分子筛影响吸附容量有哪些因素？
