题目

下列过程中，化学键一定被破坏的是（    ） A.碘升华                                B.无色透明的水晶被粉碎C.蔗糖溶于水                          D.HCl溶于水 答案：解析：碘升华克服的是范德华力，无色透明的水晶被粉碎破坏的是共价键，蔗糖溶于水克服的是范德华力，HCl溶于水破坏的是共价键。答案：BD句型转换。1. Is that a red ruler?（否定回答）   _____, _____ _____.2.That is my good friend.（改为复数句子）   _____ _____  our (我们) good            .3. This is her family photo.（变为一般疑问句）                            her family photo?4. Helen is Mr Green's daughter.（改为同义句）    Mr Green is Helen's              .5. These are orange backpacks.（改为单数句子）                              orange backpack.