支气管-肺感染和阻塞是主要发病因素的疾病是A．支气管扩张症 B．支气管肺癌 C．慢性

Do you learn from your mistakes? I hope so. But have you ever made the same mistake twice? I have．Sometimes I make the same mistake three or four times!

Sometimes，good things happen because of mistakes．Once I got on the wrong train．That was a big mistake．But on that train，I saw a good friend．I was so happy I made that mistake!

Another time I ruined a surprise．My mother planned a surprise party for my father．She told me it was a secret．But I was just a little boy and I couldn't keep the secret．I told my father about the party．At first，my mother was mad at me．But then my father said he was happy he knew about it．He said he didn't like surprises．

When a good thing comes out of a mistake，that's a happy accident!

小题1:The boy saw ______ on the wrong train.

A．his friend

B．his father

C．his mother

D．his teacher.小题2:His mother asked him to ______.

A．plan a surprise party

B．tell his father about the party.

C．keep a secret about party.

D．invite his friends to the party.小题3: What does the boy think of mistakes?

A．Mistakes are not welcome.

B．A mistake is a terrible thing.

C．All mistakes mean happy accidents.

D．Sometimes a mistake can be a good thing.

下列症状哪项不属于结核性脑膜炎早期表现

A．发热

B．惊厥

C．呕吐

D．性情改变

E．双目凝视

蒸腾作用可以降低植物体叶面的               ，促进根从土壤中             同时促进植物体内水分和              的运输。

菌阴性肺结核的概念是指（）。

A.3次痰涂片阴性

B.6次痰涂片阴性

C.3次痰涂片及1次痰培养为阴性

D.3次痰培养为阴性

E.1次痰培养为阴性

2008年8月1日张某以其自有的一辆汽车为抵押，与赵某签订为期1年的借款合同。2009年7月15日，赵某将张某抵押的不动产作为标的与李某签订买卖合同，张某得知后对此表示反对。按照我国《合同法》的有关规定，赵某与李某双方所签订的合同在效力上属于( )。

A．有效合同

B．无效合同

C．可撤销合同

D．效力待定合同