单选题：The ejection fraction rate of the patients with stem cell in

题目内容：

The ejection fraction rate of the patients with stem cell injections decreased. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

Stem Cell Therapy May Help Repair the Heart　　According to sc

Stem Cell Therapy May Help Repair the Heart　　According to scientists in the USA

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