When forbidden to surf the Internet, teenagers often _____ surfing it, saying that it provides them with colorful entertainments, a convenient means of communication as well as useful information

A．argue about

B．argue with

C．argue for

D．argue against

玉溪（24°N）某同学对传统的太阳能热水器进行改造（如右图）：将太阳能热水器集热板装在一个大玻璃箱里，并将热水器的支架改造成活动形式。12月22日正午，为使热水器受热最多，需调节活动支架，使热水器集热板与地面的夹角α为（）

A.23°26′

B.42°34′

C.47°26′

D.66°34′