易形成简单阴离子的元素是（　　）

⑴What colour is her dress ?____              A、It's Mike's .

⑵What time is it now ?____                      B、It's white and black .

⑶Whose is this ?____                                C、They are apples .

⑷What are they ?____                              D、No , she isn't .

⑸Is your mother at home ?____               E、It's five o'clock .

“数字地球”的应用领域包括(　　)

①可持续发展　②政府决策　③百姓生活　④科学研究