进入21世纪的新型恐怖主义具有的特点有（）
A.国际性
B.灵活机动，手段先进
C.高智能化、隐蔽性强、背景复杂
D.以上都是
参考答案：D
In this hotel, the bread and butter ______served for breakfast. Meanwhile, a knife and fork _____very useful for a foreigner.
A．is; is
B．are; are
C．is; are
D．are; is
