编制地图时，对各要素间的争位性矛盾，常采用的（）方法处理 A.舍弃 B.合并 C.移

某无色溶液中含有H⁺、Al³⁺、Mg²⁺三种阳离子，逐滴加入0.1moL·L^-1 NaOH溶液，消耗NaOH溶液体积（X轴）和生成沉淀（Y轴）之间的函数关系如下图所示，则溶液中H⁺、Al³⁺、Mg²⁺三种阳离子的物质的量浓度之比为（   ）

A．1:1:1

B．2:2:1

C．2:1:1

D．1:1:2

通过信息管理物流，可有效地提高整个物流的（）

A.灵活性、先进性、可靠性

B.灵活性、速度、可靠性

C.集成性、可靠性、灵活性

D.先进性、速度、可靠性

阅读理解。

     I was the middle child of three, but there was a gap of five years on either side, and I hardly saw my father

before I was eight. For this and other reasons I was somewhat lonely. I had the only child's habit of making up

stories and holding conversations with imaginary persons, and I think from the very start my literary ambitions

(文学志向) were mixed up with the feeling of being isolated (孤独) and undervalued. I knew that I had a natural

ability with words and a power of facing unpleasant facts, and I felt that this created a sort of private world in

which I could get my own back for my failure in everyday life.

     However, the quantity of serious writing which I produced all through my childhood would not add up to

half a dozen pages. I wrote my first poem at the age of four or five, my mother taking it down to dictation. I can

not remember anything about it except that it was about a tiger and the tiger had "chair-like teeth"-a good enough

expression. At eleven, when the war of 1914-18 broke out, I wrote a poem which was printed in the local (地方

的) newspaper, as was another, two years later, on the death of Kitchener. From time to time, when I was a bit

older, I wrote bad and usually unfinished "nature poems". I also, about twice, attempted a short story which was

a failure. That was the total of the would-be serious work that I actually set down on paper during all those

years.

1. The underlined word "it" in paragraph 2 refers to _____.

A. the quantity of serious writing

B. the writer's first poem

C. the writer's childhood

D. the tiger in the poem

2. From the text, we learn that as a little boy the writer _____.

A. had no playmates

B. showed his gift for writing

C. put out lots of poems and stories

D. got his first poem published in 1916

3. What can be inferred about the writer?

A. He was least favored in his family.

B. He had much difficulty in talking with others.

C. He had an unhappy childhood for lack of care.

D. His loneliness resulted in his interest in writing.

测定水泥比表面积用烘干箱的控制湿度灵敏度为（）

A、±1℃

B、±2℃

C、±3℃

D、±5℃

甲与乙签订一价款为80000元的合同，约定定金20000元。实际交付定金时乙只向甲支付了10000元，甲未提出异议。根据合同法的规定，该定金合同的效力是( )。

A．定金合同有效，定金数额为20000元

B．定金合同有效，定金数额为16000元

C．定金合同有效，定金数额为10000元

D．定金合同无效