CO2的毒性在于它能与血红蛋白结合，降低血液的输氧功能，而引起窒息。（）
参考答案：错
仔细观察图片，回答问题。
1. I lost my key. Can you find my key? Where is the key?
Yes. I can. Under the bed.
2. I lost my toothbrush. Can you find my toothbrush? Where is the toothbrush?
____________________________________________________________________
3. I lost my shirt. Can you find my shirt? Where is the shirt?
4. I lost my ball. Can you find my ball? Where is the ball?
5. I lost my book. Can you find my book? Where is the book?
6. I lost my suitcase. Can you find my suitcase? Where is the suitcase?
下列哪项是适用于徒手抗阻训练的条件？（）
A.肌力2级以上
B.肌力3级以上
C.肌力4级
D.肌力4级以上
E.肌力5级
