我国古代建筑各种木构件的用料尺寸，均用“斗口”及下列何种“直径模数”计算（）. A.

水是生命之源，水资源的保护和合理利用已受到人们的普遍关注．请参与讨论下列有关问题：

（1）下列能确认水是由氧元素和氢元素组成的实验是______（填序号）．

A．水的静置      B．水的蒸发      C．水的电解      D．水的净化

（2）下列做法有利于保护水资源的是______（填序号）．

A．大量使用化肥农药               B．工业废水处理达标后排放

C．使用含磷洗衣粉                 D．生活污水直接排放

（3）波尔多液是由硫酸铜和熟石灰加水配制而成，配制时发生反应的化学方程式是______．

（4）只用水能区分下列各组物质（物质均为白色固体）的是______（填序号）．

A．生石灰、熟石灰                 B．碳酸钙、硫酸钡

C．纯碱、食盐                     D．硫酸铜、氯化钾

（5）电解水时，常在水中加入硫酸使反应容易进行，硫酸本身并不被分解．现用45g溶质质量分数为8%的硫酸溶液进行电解水的实验，一段时间后，产生0.5mol氢气．计算：

①被电解的水的质量为多少克；

______（写出计算过程）

②电解后的硫酸溶液的溶质质量分数为______．

Beldon and Canfield are two seashore towns, not far apart. Both towns have many hotels, and in summer the hotels are full of holiday-makers and other tourists.

Last August there was a fire at the Seabreeze Hotel in Beldon. The next day, this news appeared on page two of the town’s newspaper. The Beldon Post:

FIRE AT SEABREEZE

Late last night firemen hurried to the Seabreeze Hotel and quickly put out a small fire in a bedroom. The hotel manager said that a cigarette started the fire. We say again to all our visitors： “Please don’t smoke cigarettes in bed.” This was Beldon’s first hotel fire for five years.

The Canfield Times gave the news in these words on page one：

ANOTHER BELDON HOTEL CATCHES FIRE

Last night Beldon firemen arrived just too late to save clothing, bedclothes and some furniture at the Seabreeze Hotel. An angry holiday-maker said, “An electric lamp probably started the fire. The bedroom lamps are very old at some of these hotels. When I put my bedside light on, I heard a funny noise from the lamp.” We are glad to tell our readers that this sort of adventure does not happen in Canfield.

What are the facts, then? It is never easy to find out the exact truth about an accident. There was a fire at the Seabreeze Hotel last August: that is one fact. Do we know anything else? Yes, we know that firemen went to the hotel.

Now what do you think of the rest of the “news” ?

小题1:Which of the following best gives the main idea of this text?

A．Beldon and Canfield are both good places for tourists in summer.

B．A fire broke out night in Seabreeze Hotel last summer.

C．It was not easy to find out exact truth from newspapers.

D．Two newspapers gave reports on the same matter.小题2:Which of the following are probably facts? 

a. The fire broke out in a bedroom at the hotel.

b. A cigarette started the fire.

c. An old lamp started the fire.

d. The fire broke out at night.

e. There has never been a fire in Canfield.

A．b and c

B．a and d

C．c and e

D．a and c小题3:The Canfield Times used the headline like this in order to make its readers think _______. 

A．hotels in Beldon often catch fire

B．hotels in Beldon don’t often catch fire

C．this was the second fire at the Seabreeze Hotel

D．Beldon was a good place except that hotels there are not quite safe小题4:The Canfield newspaper gave a report just the opposite to the Beldon Post by saying that _______. 

A．the bedroom lamps were very old at the Seabreeze Hotel

B．the bedroom lights made funny noise when the fire took place

C．the firemen failed to save clothing, bedclothes and other things

D．such accidents never happened in Canfield for the past 5 years

见票后定期付款的商业汇票，持票人应当自到期之日起（ ）内向付款人提示付款。

A．一个月

B．六个月

C．10日

D．30日

电子商业汇票系统在处理系统业务中利用（）保证业务的完整性、不可抵赖性及用户身份的真实性。

A、业务双签

B、业务复核

C、数字证书

D、业务核对

在生产中，母牛的输精时间安排是，早上发情，（）输精。

A：当天上午

B：当天下午

C：当天夜里

D：第二天早上