西周时期，为解决贵族之间在权力、财产和土地继承上的矛盾而实行的制度是[ ]
A、宗法制
B、分封制
C、井田制
D、世卿世禄制
答案：A
—Can you guess ______ the new T-shirt last week?
—Sorry, I don’t know.[ ]
A．how much did she pay for
B．how much does she pay for
C．how much she paid for
某中药提取物，Molish反应、醋酐-浓硫酸反应和三氯化铁-冰醋酸反应均呈阳性，提示该中药可能含有
A．黄酮苷B．三萜苷C．强心苷D．蒽醌苷E．木脂素苷
