可摘局部义齿人工牙的功能是（） A.连接作用 B.修复作用 C.支持作用

不产生肠毒素的细菌是（）

A.霍乱弧菌

B.产毒性大肠杆菌

C.幽门螺杆菌

D.沙门菌

E.金黄色葡萄球菌

某企业编制12月份“销售预算”，已知该企业在10月份和11月份发生的销售收入 (不含税)分别为100万元和150万元，预计12月份发生的销售收入(不含税)为130万元，该企业每月的含税销售收入在本月收回50%，下月收回30%，下下月收回20%，增值税税率为17%，假定不考虑其他因素，则该企业预计资产负债表年末“应收账款”项目为( )万元。

A．128.15

B．76.05

C．111.15

D．35.10

Honeybees are disappearing for unknown reasons around the United States. Last winter, bees disappeared from 23 percent of American beekeeping businesses. Causes of the phenomenon, however, have remained a mystery.

Now, scientists from several universities and the United States Department of Agriculture say they have a possible explanation for the bee decline（数量下降）. It is a little known virus called Israeli acute--paralysis virus (IAPV) .The virus kills bees. Researchers in Israel first described it in 2004 , but until now, bee experts hadn’t paid much attention to it.

When trying to find out why the bees were disappearing, a research team at Columbia University studied bee colonies ( 群体), some with and the others without decline. The research turned up large numbers of two types of fungi (真菌) once suspected of causing the bee decline. The research results, however, showed that the fungi were almost as common in colonies without a decline as they were in colonies with a decline. The researchers concluded that the two fungi probably weren’t the cause.

Studies of the presence of IAPV, however, showed more interesting information. In those studies, done by a team at Pennsylvania State University in University Park, the virus showed up in 83 percent of samples from colonies with symptoms (症状). Only five percent of samples from symptomless colonies had it.

Scientists still don’t know whether IAPIV can single--handedly cause the bee decline. They believe that even if the virus is making colonies sick , it could have a partner in crime. It’s possible, for instance, that insects or chemicals in the environment weaken bees, making them more likely to catch IAPV.

Scientists are still trying to figure out how IAPV came to the United States. The United States currently allows bee products to be imported from Canada, Australia, and New Zealand. If it turns out that this trade is spreading disease, the rules might eventually change.

68. According to the passage ，IAPV is a virus that ______.

A. hasn’t attracted much attention      

B. well-known to doctors and scientist

C. was first found by Austrian researchers  

D. is dangerous to animals and human beings

69. The underlined sentence in the fifth paragraph probably means______.

A. the virus could also cause other damages

B. there must be something that is the real cause

C. IAPV is not the only cause for the bee decline

D. the virus may be caused by the polluted environment

70. From the third and fourth paragraphs, we know researchers draw their conclusions by means of _______.

A. calculating        B. comparing  C. examining     D. investigating

71. What still remains unknown to American scientists according to the passage?

A. How and why to kill IAPV.

B. How IAPV came to America.

C. Whether bee products should be imported.

D. How to change the rules of the bee products trade.

72. The best title for this passage would be _____.

A. Bee Disease     B. How to Kill IAPV 

C. A Virus—IAPV   D. Two Types of Fungi

仪表显示当前冷却液的温度是90度。

Riothamus, a fifth-century king of the Britons, was betrayed by an associate, fought bravely against the Goths but was defeated, and disappeared mysteriously. Riothamus’ activities, and only those of Riothamus, match almost exactly those attributed to King Arthur. Therefore, Riothamus must be the historical model for the legendary King Arthur.
The argument above requires at least one additional premise. Which of the following could be such a required premise

A．Modern historians have documented the activities of Riothamus better than those of any other fifth-century king.

B．The stories told about King Arthur are not strictly fictitious but are based on a historical person and historical events.

C．Riothamus’ associates were the authors of the original legends about King Arthur.

D．Legends about the fifth century usually embellish and romanticize the actual conditions of the lives of fifth-century nobility.

E．(E) Posterity usually remembers legends better than it remembers the actual historical events on which they are based.