关于CO中毒,正确的是()
A.血液中COHb升高
B.导致Hb氧离曲线左移
C.损害线粒体功能
D.抑制细胞色素氧化酶活性
E.高压氧舱治疗效果好
参考答案:A, B, C, D, E
I think students _______ to do homework with friends.[ ]
A. should allow
B. should be allowed
C. were allowed
D. must be allowing
自然景观的地貌大致可以分为哪几类形态()
A.峡谷平原高山丘陵
B.峰林洞穴石柱溶岩
C.沙丘戈壁
D.沼泽湖泊海洋