最早于妊娠几周可显示胎盘()
A.4周
B.8周
C.10周
D.20周
E.24周
参考答案:B
“I promise that she _____ get a nice present on her birthday.” “Will it be a great surprise to her?”
A.should
B.must
C.would
D.shall
容器类java.awt.Container的父类是
A.java.awt.Window
B.java.awt.Component
C.java.awt.Frame
D.java.awt.Panel