在脸谱中，红、黄、蓝、白、黑各代表什么含义？
参考答案：
红为忠，黄为残暴，蓝为草莽，白为 * * ，黑为正。（还有绿为侠义，金银为神妖等）。
甾体激素类最常用的含量测定方法有：
A．分光光度法B．气相色谱法C．高压液相色谱法D．A+CE．旋光法
Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.
RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.
（49）是（）
A.appearances
B.emerges
C.recognizes
D.solves
