1．Malcolm wants to visit Isabella after school today and knows the street where she lives but doesn't know her house number.She tells him,“My house number has two digits,and exactly three of the following four statements about it are true.”（1）It is prime.
（2）It is even.
（3）It is divisible by 7.
（4）One of its digits is 9.
This information allows Malcolm to determine Isabella's house number.What is its units digit？（　?。?br />Malcolm今天放學(xué)后想去拜訪Isabella,他知道她住在哪條街，但不知道她的門牌號(hào)碼。她告訴他：“我的門牌號(hào)有兩位數(shù)，以下四個(gè)陳述中有三個(gè)是正確的?！?br />（1）它是一個(gè)質(zhì)數(shù)。
（2）它是偶數(shù)。
（3）它可以被7整除。
（4）它的其中一個(gè)數(shù)字是9。
這些信息使Malcolm能夠確定Isabella的門牌號(hào)碼。它的個(gè)位數(shù)字是多少？（　?。?/div>

2．The 5-digit number is divisible by 9.What is the remainder when this number is divided by 8？（　?。?br />5位數(shù)可以被9整除。這個(gè)數(shù)除以8的余數(shù)是多少？（　?。?/div>

3．The digits 1，2，3，4，and 5 are each used once to write a five-digit number PQRST.The three-digit number PQR is divisible by 4，the three-digit number QRS is divisible by 5，and the three-digit number RST is divisible by 3.What is P？（　?。?br />數(shù)字1、2、3、4和5分別被用一次來(lái)寫一個(gè)五位數(shù)PQRST。三位數(shù)PQR可以被4整除，三位數(shù)QRS可以被5整除，而三位數(shù)RST可以被3整除。P的值是多少？（　　）