一个三角形中的两个内角的度数分别是30。和60。，这个三角形是[ ]
A．锐角三角形
B．直角三角形
C．钝角三角形
答案：B
If cauliflowers are not ________from extreme temperatures, the heads get discolored.
A．protected
B．shelter
C．shade
D．saved
It’s very kind ______ you ______ help us. [ ]
A. of, of
B. of, with
C. of, to
D. to, of
