健康牙龈沟内菌斑主要细菌是
A.革兰阳阳性球菌 B.革兰阳性杆菌 C.革兰阴性球菌 D.革兰阴性杆菌 E.真菌
参考答案:A
---How does Jack usually go to school?
---He_____________ride a bike, but now he_______________there to lose weight.
A.used to, is used to walk
B.was used to, is used to walking
C.was used to, is used to walk
D.used to, is used to walking
现在医生已经能够通过()对远在千里之外的病人进行诊断和治疗。
A.电视
B.电话
C.网上医院
D.传真