A．carefulB．intelligentC．quietD．wearyWe should be cautio……

单项选择题When visiting museums nowadays, people can take part in many activities.

单项选择题New York’s American Museum of Natural History is opened recently.

单项选择题In science museums nowadays visitors are not allowed to touch or operate the objects on display.

单项选择题In science museums today, people no longer feel strange in the world of science but gain scientific knowledge by themselves.

单项选择题In America today, all science museums are open to the public and free.