城市规划中，一般将街道设计成与子午线成30°～60°的夹角，考虑的主要因素是 [ ]
A、交通方便
B、日照条件
C、城市美观
D、污染较少
答案：B
杜仲粉末显微特征中可见
A．三面增厚的木栓细胞
B．方晶
C．橡胶丝
D．油细胞
E．石细胞
—John is in a bad mood these days. Do you know why?
—His grandfather has just passed away. Let’s try to _______.
A．bring him up
B．wake him up
C．cheer him up
D．give him up
