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【多选题】
儿茶酚胺对心肌细胞离子通道的影响是______。A.
增强心室肌细胞平台期Ca 2+ 内流和RYRCa 2+ 释放
B.
增强结细胞4期的内向电流
C.
降低肌钙蛋白与Ca 2+ 的亲和力
D.
促进心室肌细胞0期Na + 的内流
E.
促进房室结细胞0期Ca 2+ 的内流
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【单选题】My parents advise me in that river. It's dangerous.
A.
swimming
B.
swim
C.
not to swim
D.
not swim
【简答题】That's my (advise) to you.
【单选题】There are two character strings：s and t.s='My favor is computer'，t=substr(s，9，5)．Then the result after operation is
A.
S='My favor is computer'； t='compu'；
B.
S='My favor is computer'； t='is co'；
C.
S='My favor'； t='is co'；
D.
S='My favor'； t='is computer'；
【单选题】When I have some worries, my close friends always advise me ______too much.
A.
don’t worry
B.
not to worry
C.
worry
D.
worrying
【单选题】There are hardly any people on the hill in winter, ______ ? [ ]
A.
are they
B.
aren’t they
C.
aren't there
D.
are there
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