The White House said on Monday that the relations between the United States and China were in______ good shape but acknowledge some differences between _____ two countries.

A∕ , the            B a, the           C the, the           D the, ∕

导致下列环境问题的主要原因与排放SO₂有关的是

A．酸雨

B．光化学烟雾

C．臭氧层空洞

D．温室效应