桔梗的气味为（）
A.无臭，味甘
B.无臭，味微甜后苦
C.无臭，味苦、辛
D.气香，味甘微涩
E.气香，味甘、苦
参考答案：B
Walmart, which is one of the largest American supermarket chains, _______ some of its store open 24 hours on Mondays through Saturdays.
A．keep
B．keeps
C．have kept
D．had kept
《砌体工程施工质量验收规范》(GB50203-2002)规定，凡在砂浆中掺入()时，应有砌体强度的形式检验报告。
A、有机塑化剂
B、缓凝剂
C、早强剂
D、防冻剂
