可引起低血钾的原因有（）。 A.钾的摄入不足 B.尿钾排出过多 C.碱中毒 D.胰岛

Here are two letters to George and his replies.

小题1:Alice is worrying about ________.

A. her friends   B. her marks             C. her height                   D her weight

小题2:Bob should ________ according to George’s letter.

A．take more exercise

B．talk to his friends

C．join a basketball team

D．learn some French.小题3:George advises Alice to talk to ________ for help.

A．her mother

B．her teacher

C．Bob’s teacher

D．Bob’s friends

比较大小

98765______10010153000000______50300000．

十进制41转换成二进制为（）。

A.111111

B.101111

C.100101

D.100111

E.101001

如何从IOP硬件指示灯状态及IOP状态画面上判断IOP好坏？

病毒的入侵途径是（）。

A.植物细嫩部位

B.自然孔口

C.植物根部

D.微伤口