将4006300保留3个有效数字,其近似数为( )。
4.01×106
The temperature of our earth will become higher and higher _____ we take actions right now. [ ]
A. unless
B. if
C. as soon as
D. as
党参主产于()
A.四川、陕西
B.云南、贵州
C.甘肃、新疆
D.青海、宁夏
E.山西、陕西、甘肃