秋季叶色变红色的树种是（）
A.鹅掌楸
B.喜树
C.银杏
D.丝棉木
参考答案：B
最小混相压力
After he had solved the math problem, he _____ to deal with another one.
A．went on
B．put on
C．gave up
D．put up
