左心衰竭最早出现的症状包括（）。 A.端坐呼吸 B.心悸 C.心源_爱下问搜题

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问题单项选择题 A1/A2型题

左心衰竭最早出现的症状包括（）。

A.端坐呼吸

B.心悸

C.心源性哮喘

D.劳力性呼吸困难

E.双下肢水肿

答案

参考答案：B

解析：左心衰竭早期出现交感神经代偿性兴奋的表现，出现代偿期症状如心悸等。

改错题

A friend is someone can let you feel warm when you
are depressed (沮丧). I have many friends. But, I only have
one best friend and it's Steven. He is the same age to me.
He is taller than me. Basketball is in his favorite sport.
We are in the same classes. He likes studying and is good
to it , so he gets high marks. He is very cute. I like playing
with he. I like playing games but he likes reading books.
We learn from each other or help each other.
He will help me if I ever get into troubles. Such will I.
I hope our friendship will laster forever.

1.__________
2.__________
3.__________
4.__________
5.__________
6.__________
7.__________
8.__________
9.__________
10.__________

选择题

男性体细胞中的染色体可表示为[ ]

A．22对+XY

B．22对+XX

C．22对+Y

D．45+Y