关于肾恶性肿瘤的描述,正确的是()
A.均有发热和肿块
B.Wilms瘤主要症状是血尿
C.肾盂癌多为鳞癌
D.肾癌多引起肺和骨转移
E.早期即有放射性疼痛
参考答案:D
Though the teacher had explained it three times, many students still felt ____. It was so difficult a
physics problem.
[ ]
A. amused
B. excited
C. frightened
D. confused
分组学习的涵义