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