下列不是造成西瓜歪瓜的原因是（）。
A.花芽分化期遇到低温
B.形成畸形花
C.植株生长过旺
D.授粉受精不良
参考答案：C
--- “Where have you been?”
--- “I got caught in traffic; otherwise _____ sooner.”
A．I would be here
B．I have been here
C．I had been here
D．I would have been here
发送电子邮件所用的协议是（）。
A.SMTP
B.POP3
C.NNTP
D.FTP
