赵师傅透过放大5倍的放大镜从正上方看30°的角，则通过放大镜他看到的角等于 [ ]
A．30°
B．90°
C．150°
D．180°
答案：A
过冷沸腾
My parents always tell me that it's not a good idea to spend our income______.[ ]
A. in vain
B. in advance
C. in general
D. in particular
