晚來天欲雪，能飲一杯無？
参考答案：
—Do you often plant trees in spring?
—Yes. Many trees _____in our school every year.
A. plant
B. are planting
C. are planted
D. were planting
混凝土标准养护龄期是28d，龄期计算从拌合物（）开始
A.加水泥
B.搅拌
C.加集料
D.加水
