--- ____I take the newspaper to the classroom?

---No, you mustn’t. You ______ read it only here.

A．Must, can

B．May, can

C．Need, must

D．Must, must

区别氧气、空气、二氧化碳三瓶气体最简便的方法是 [ ]

A．将燃着的木条分别伸入瓶中

B．将带火星的木条分别伸入瓶中

C．分别注入澄清的石灰水

D．分别注入紫色石蕊溶液