两种胰岛素混合配置时，必须先抽普通胰岛素，是为防止（）A．发生中和反应B．丧失普通胰岛素的速效特

Friend A: This meal is on me. Friend B: Thanks, ______ but isn't it my turn to treat you？

A．It's none of your business

B．I'll treat you

C．I invite you

D．My pleasure

Friend A: This meal is on me. Friend B: Thanks, ______ but isn't it my turn to treat you？

A．It's none of your business

B．I'll treat you

C．I invite you

D．My pleasure

Friend A: This meal is on me. Friend B: Thanks, ______ but isn't it my turn to treat you？

A．It's none of your business

B．I'll treat you

C．I invite you

D．My pleasure

Please don't Bobby when he you.

A、 turn down turns to

B、 turn away from turns into

C、 turn off turns up

D、 turn out turns over

A true friend is one who offers you a helping hand when you are__________.

A.in order

B.in public

C.in time

D.in trouble

A．You can enjoy your favorite foods but don't eat too much.

B．You must not throw away the foods you enjoy, for it is reasonable.

C．You shouldn't refuse anything you like and eat it as much as possible.

D．You ought to accept what you enjoy and refuse what you don' t.

Don't worry. I'd ______ your baby when you are away at work.

A．see to

B．see through

C．see off

D．see over