Unit 7 what's the highest mountain in the world?同步练习I、选择填空(15分)( )1.How to read 4,444,444 in English?A. four millions, four hundreds and forty-four thousand, four hundreds and forty-fourB. four million, four hundred forty-four thousand, four hundred forty-fourC. four, four four four, four four fourD. four million, four hundred and forty-four thousand, four hundred and forty-four ( )2. China is ________ country in the world. &..