27．When your child asks you questions，you should giVe her_______． 28．We set up experiments to test Otlr ideas about_______． 29．In the experiment，one end 0f the string was attached t0_______． 30．‘rhe experiment shows that salt changes the behaViour 0f_______．

单项选择题A．What exactly is 8cienceB．HOW do you find an explanationC．What topics do you needD．HOW do you answer your child’s questionsE．Where does yollr child study scienceF．How do you set up the experiment on salt and water

单项选择题The best way to leave the building during an earthquake is to get into a lift