连续使用后易产生身体依赖性，能成瘾癖的药品是
A．毒性药品B．麻醉药品C．精神药品D．放射性药品E．戒毒药品
参考答案：B
Be _______ — you can’t expect me to finish all this work in so little time.
A．reasonable
B．confident
C．creative
D．grateful
The teacher’s efforts ______ when one of his students was admitted to Beijing University last summer.
A．paid back
B．paid off
C．paid for
D．paid out
