收缩时,使瞳孔转向外侧的是()肌,使瞳孔转向上外方的是()肌。
参考答案:外直;下斜
—Listen ! Helen is singing in the next room.
—It _______ be Helen. She has gone to Beijing.
A.can’t
B.mustn’t
C.may
D.should
On careful examination of your samples, we found that the cotton piece goods are well () standard in quality.
A. until
B. up to
C. in
D. into