人大代表[ ]
①是人民行使国家权力的机关
②由公民直接选举产生的
③代表人民行使国家权力
④对人民负责,受人民监督
A.②③
B.①④
C.③④
D.②④
答案:C
(2013·东北四市一模)After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent.
A.that
B.what
C.when
D.at which
胰高血糖素的生理作用是()
A.促进糖元分解,抑制糖元异生
B.促进脂肪分解,使酮体生成增加
C.促进胆汁和胃液分泌
D.促进胰岛素分泌,抑制降钙素分泌
E.提高心肌兴奋性