眼电图产生于（）
A.视网膜色素上皮细胞：
B.视网膜杆细胞：
C.视网膜锥细胞：
D.视网膜外界膜：
E.视网膜内界膜：
参考答案：A
He said, "You are sure to get a warm welcome there."
He said that we __ sure to get a warm welcome there. [ ]
A. am
B. was
C. were
D. are
608÷2的商中间有[ ]
A．1个0
B．2个0
C．没有0
