根据《保安服务管理条例》的规定，不属于保卫人员义务的是（）。
A.遵守纪律
B.开展报警监控活动
C.发行劳动合同
D.保守秘密
参考答案：B
黄酮类化合物的紫外光谱中，峰带Ⅱ很强，而带I很弱的化合物是
A．查耳酮
B．异黄酮
C．二氢黄酮
D．二氢黄酮醇
E．黄酮醇
The train ________ arrive at 1:30, but it was an hour late.
A. was about to
B. was likely to
C. was certain to
D. was supposed to
