观察是科学探究的一种基本方法。下列各项活动中属于观察的是

A．上网搜索资料

B．用直尺测量肾蕨的高度

C．进行人口普查

D．用放大镜看蚂蚁的结构

The shop ________ at 8:00 a.m. and it ________ for ten hours every day. [ ]

A. opens; is open

B. is opened; opens

C. is open; has opened

D. opened; opens