_____ is reported in the newspapers, talks between the two countries are making progress. [ ]

A. It

B. As

C. That

D. What

物质的性质决定物质的用途。下列物质的用途中，利用其化学性质的是

①甲烷用作燃料 ②氢气用于填充探空气球 ③氮气用做保护气 ④干冰用作制冷剂 ⑤二氧化碳用作气体肥料 ⑥木炭用于除冰箱异味 [ ]

A．①②③

B．①③

C．①③⑤

D．①⑤⑥