皮皮学，免费搜题
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【单选题】
已知有效的抗心绞痛药物,主要是通过起哪个作用( )A.
降低心肌收缩力
B.
减慢心率
C.
降低心肌需氧量
D.
降低交感神经兴奋的效应
E.
延长动作电位时程
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— David, look at the man in white over there. Can you tell me _____? — He is a doctor. [ ]
A.
Who is he
B.
who he is
C.
what is he
D.
what he is
【单选题】— Look at the boy running on the ground, Is it David? — It _____ be him, he has just gone to the teacher's office. [ ]
A.
must
B.
can't
C.
could
D.
may
【单选题】--David, look at the man in the over there. Can you tell me____? - -He is a doctor.
A.
who is he
B.
who he is
C.
what does he do
D.
what he does
【简答题】v. to fail to take care of sb/sth; to not give enough attention to sth
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