以两点A(－3，－1)和B(5,5)为直径端点的圆的方程是( ) A．(x－1)

Mrs. White: Mrs. Green, could you do something for mc. please?

Mrs. Green: Yes, of course, Mrs. White!______小题1:

Mrs. White: Well, my husband and I are leaving for London for a holiday.________小题2:

Could yon look after him while we’re away?

Mrs. Green:________小题3: Tom is a smart boy. I’d love to look after him. What do I have to do?

Mrs. While: Nothing ________小题4:Cook dinner for him and put him to bed at ten.

Mr. Green: Don’t worry.

’Mrs. White: Thank you so much. Mrs. Green.

Mrs. Green:_小题5:

下列方法或试剂不能用来区分氧气和二氧化碳的是[ ]

A．澄清石灰水

B．紫色石蕊溶液

C．观察颜色

D．将燃着的木条分别伸入集气瓶中

毒性反应（）

A.与药物剂量无关

B.与药物的使用时间无关

C.常造成机体的生理性损害

D.大多为难以预知的反应

E.有时也与机体高敏性有关

静息电位（或最大舒张电位）水平既影响心肌的电生理特性，又影响其机械特性。（）

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