六(1)班学生有一天请病假1人,参加校外数学竞赛2人,实到51人,缺席人数与全班人数的比是( )。
1:18
______肠管的病理变化局限于大肠( )。
A.大肠杆菌病
B.猪梭菌性肠炎
C.猪痢疾
D.猪传染性胃肠炎
E.猪瘟
The teacher, together with the students, _ __ discussing Reading Skills that ______ newly published in America.
A.are; were
B.is; were
C.are; was
D.is; was