急！！请教0410语法3道

willazhanglanUID: 2137101

30.(Some)seeds are viable,or capable of (growing)into healthy plants,for onl(a few)days after(fall) from the parent tree.
选D
31.Statistics (indicate)that(approximate)every 22years--within a range of 3 to 4 years--a(major)drought (occurs)in the United States.
选A，我觉得B应为approximately
39.(By)1810 the 23 towns of Hampshire County,Masschusetts,(had reached)a remarkable (uniform)of economic development(as well as) population density.
选D

sindy_kingUID: 2116300

fall --->falling

好像有人说Statistics 作＂统计数据＂是不可数名词

as well as that of

个人意见：）

willazhanglanUID: 2137101

谢谢了

雷鼠UID: 2159778

approximate +时间是可以的