题目

实验室常用的下列仪器中，用合成材料制成的是（ ）                  A．                                                 塑料药匙            B．                            不锈钢坩埚钳        C．                            陶瓷蒸发皿          D．                               玻璃集气瓶                                          �It is not easy to learn English well,   but if you ________,   you will succeed in the end. [     ]A. hang up    B. hang aboutC. hang on    D. hang around