排便时脱出肛门，需用手指推才能还纳的圆形肿物是（）。
A.混合痔
B.环形痔
C.直肠脱垂
D.内痔
E.外痔
参考答案：D
______ to school by boat is ______ fun than taking a bus. [ ]
A．Go, a lot of
B．To go, many more
C．Going, a lot more
D．Goes, a lot
液化气的进罐温度应不大于（）℃，以保证正常收油和储存安全。
A.30℃
B.40℃
C.60℃
