如果到人家做客，在进门与落座时，主客相互客气行礼谦让，这时行的是作揖之礼，称为“（）”
A.趋礼
B.揖让
C.行礼
D.稽首
参考答案：B
Scientists are increasingly _____ that the earth is getting hotter because of carbon dioxide and other gases.
A．convinced
B．confident
C．concerned
D．conscious
低钾血症一般不表现为
A．碱中毒B．碱性尿C．心电图出现u波D．恶心呕吐E．腱反射减弱
