按卫生监督的对象分类，卫生监督包括（）A.预防性卫生监督、经常性卫生监督 B.公共卫

稳定振荡器频率的措施中，减小负载将（）。

阅读理解。

     Every object in the world will tell a story. Even the most ordinary objects can present to us powerful

images. Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary.

Such is the case with an old leather shoe in a museum in Alaska. At first glance it does not look like much. It is a woman's shoe of a style popular in the 1890s. But what is different about this shoe is where it was

found. It was discovered on the Checkout Pass, the famous trail used by the people seeking gold in

Alaska. Who it belonged to or why it was left there is not known. Was it perhaps dropped by accident as

the woman climbed up the 1500 stairs carved outface? Or did she throw away goods that she didn't need

in order to travel lighter?

     Over 100, 000 people with "gold fever" made this trip hoping to become millionaires. Few of them

understood that on their way they would have to cross a harsh wildness. Unprepared for such a

dangerous journey, many died of starvation and exposure to the cold weather.

     The Canadian government finally started requiring the gold seekers to bring one ton of supplies with

them. This was thought to be enough for a person to survive for one year. They would carry their supplies

in backpacks (背包) each weighing up to fifty pounds; it usually took at least 40 trips to get everything to

the top and over the pass. Whoever dropped the shoe must have been a brave and determined woman.

Perhaps she was successful and made it to Alaska. Perhaps she had to turn back in defeat. No one will

ever know for sure, but what we do know is that she took part in one of the greatest adventures in the

19th century.

1.  An ordinary woman's leather shoes is considered unusual because _______.  

A. it was an important clue to life in the past

B. it was found on a famous trail

C. it at one time belonged to a VIP

D. it was a fashionable shoe at that time

2. According to this passage, in the past many people who went to Alaska _______.  

A. eventually became millionaires

B. brought with them many shoes

C. had conflicts with the Eskimos

D. were not properly equipped

3. The Canadian government made gold seekers bring one year's supplies with them so that _________.

A. they would not die of hunger and cold

B. the army would have enough food for fighting a war

C. they would change these goods with the Eskimos

D. the supplies would make Alaska rich

4. No matter what happened to the woman who owned the shoe, _______.  

A. she must have lived a happy life

B. she certainly dropped the shoe on purpose

C. her adventurous spirit is definitely admired

D. her other shoes were equally fashionable

汤圆变红后不能食用的原因是：（）

A.变红的地方不易被消化，容易引起消化不良 

B.变红后汤圆的口感不好 

C.变红是被酵米面黄杆菌污染的结果，由于该菌能产生毒素，食用后引起中毒 

D.以上说法均不正确

学术会议对学术成果具有承认作用。

59，40，48，（），37，18

A．29

B．32

C．44

D．43