President Hu cut short his visit to Latin America and returned to Beijing on Saturday ______ the 7.1-magnitude quake, ______struck the Tibetan Autonomous Prefecture of Yushu Wednesday morning, and left 1,484 dead with 312 still missing.

A．due to; which

B．owing to ;that

C．as to ; when

D．thanks to; where

在下列化学式中，若X代表某种元素，则错误的一个化学式是（　　）

A．X₂O₃

B．X₂Cl₃

C．X（NO₃）₃

D．X₂（SO₄）₃