PRL降低常见于()。
A.垂体瘤
B.席汉综合征
C.乳腺癌
D.库欣综合征
E.以上均不是
参考答案:B
一匹布,用去25米,还剩45米,用去了______,还剩下______.
We____ Chinese. So you and I have black eyes and black hair. [ ]
A. all are
B. are all
C. are both
D. both are