号称世界“雨极”的是下列哪个地区( )
A.火烧寮
B.乞拉朋齐
C.吐鲁番盆地
D.沙漠
答案:B
--- How is your English study?
--- Not bad. But I ______ learning English grammar.
A.am interested in
B.am good at
C.have a little trouble
D.have no trouble
硫化氢的化学式为H2S,它是一种具有臭鸡蛋气味的气体,其中硫元素的化合价是( )
A.+1
B.-l
C.+2
D.-2