下列四条线段成比例的是( )
A.1cm,2cm,4cm,6cm
B.3cm,4cm,7cm,8cm
C.2cm,4cm,8cm,16cm
D.1cm,3cm,5cm,7cm
答案:C
婴儿出生后,啼哭拒食,口腔粘膜出现微突的白色绒膜,自行撕去露出渗血的糜烂面多系()
A.白斑
B.扁平苔藓
C.雪口病
D.球菌性口炎
E.角化上皮珠
The number of the students in our school _____ large.
A.are
B.is
C.am
D.be