表面麻醉常用局麻药为()A．1％普鲁卡因 B．0．5％利多卡因 C．1％利多卡因 D

Will was stupefied with exhaustion, and he _____ his head on the grass under one of the trees and slept, but he saw a cat acting strangely. 

A．should have lied

B．ought to have lay

C．might have laid

D．must have laid

小华的爸爸把支出300元记作-300元，那么+200元表示（　　）

A．又支出200元

B．收入200元

C．支出100元

D．收入500元

将生物技术与农业常规育种技术相结合，已经获得了多种（）

A、转基因作物 

B、番茄烟草 

C、植物疫苗 

D、石油草

二期梅毒患者需做（）

A.TPPARPR

B.醋酸白试验

C.HIV

D.衣原体检查

E.真菌涂片

Evelyn Mastakis, CFA, is a quantitative analyst in a local securities firm and does research about the difference between ordinary annuity and annuitydue. If both have the same number of payments, payment amount, and frequency of payments and are discounted at the same positive rate, the present value of the ordinary annuity is:（）

A. greater than the present value of the annuity due.

B. less than the present value of the annuity due.

C. equal to the present value of the annuity due.