凭证式国债质押贷款的贷款期限最长不得超过（）年，且不得超过国债的到期日。
A.1
B.2
C.3
D.5
参考答案：C
— John seems happy, even though his wife left him and he lost his job.
— I think he ____ to put on a brave face.[ ]
A. will try
B. has tried
C. tries
D. is trying
椎体属于（）类型的骨（）
A.长骨
B.短骨
C.扁骨
D.不规则骨
E.以上都不是
