图案的造型方法、构成形式和（）是图案设计的基础
A、表现技法
B、表现手段
C、空间想象
D、色相应用
参考答案：A
18. It was because of English girlfriend, believe it or not, ______ his English improved so greatly.
A．which
B．as
C．that
D．what
