某一等距连续变量数列中，某一组的下限值是120，其相邻组的组中值是60，则该组的上限值是（）。
A.240
B.180
C.220
D.260
参考答案：B
It is a mainly dry country with only a few coastal areas that have ____ rainfall to support a large population．
A．desperate
B．stubborn
C．violent
D．adequate
调节呼吸运动的基本中枢位于（）
A.脊髓
B.延髓
C.脑桥
D.小脑
E.中脑
