指出下列“之”字用法与其他三句不同的一项[ ]
A.面刺寡人之过
B.公与之乘
C.操蛇之神闻之
D.故克之
答案:A
They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.
A.what
B.that
C.which
D.who
20G的含碳量近似为()。
A.20%
B.2%
C.0.2%
D.0.02%