维持 * * 正常生态平衡的细菌为()
A.乳杆菌
B.棒状杆菌
C.肠球菌
D.链球菌
E.葡萄球菌
参考答案:A
He is interested in farming and is ________ to know everything about the farm. [ ]
A. eager
B. anxious
C. worried
D. busy
急性心包填塞是胸部外伤中较为严重的一种,不是因为()
A.心脏舒张受限
B.阻碍静脉血回流
C.失血量过多
D.心排血量迅速减少