题目

词汇运用。根据句意及汉语提示，填入恰当的单词。 1．—What did you think of the story? —It was________(绝妙的)． 2．Linda________(不喜欢) math.She thinks it's difficult. 3．________(在线) shopping is very popular among young people. 4．It's________(必要的) for children to drink a cup of milk every day. 5．Amy likes looking at herself in the________(镜子) after she gets up.（1）如图甲所示，用竖直悬挂的泡沫塑料球接触发声的音叉时，泡沫塑料球被弹起，这个实验是为了验证 ______；（2）如图乙所示，敲击右边的音叉，左边完全相同的音叉把泡沫塑料球弹起，这个实验是为了验证 ______；（3）若把这两个实验移到月球上去做，不能看到泡沫塑料球被弹起的图是 ______，原因是 ______．