挡土墙高7m,墙背直立、光滑，墙后填土面水平，填土面上有均布荷载q=20kPa，填土

关于佐剂的叙述，下列哪项错误（）。

A.佐剂是特异性免疫增强剂

B.与免疫原混合后可增强抗原在体内存留时间

C.最常用于动物实验的是弗氏佐剂和弗氏不完全佐剂

D.可刺激Mφ，增加它对抗原的处理和递呈

E.可刺激淋巴细胞的增生和分化

阅读理解。

     We have all experienced days when everything goes wrong. A day may begin well enough, but suddenly

everything seems to get out of control. It seems as if a single unimportant event may cause a number of

things to happen. Let us suppose that you are preparing a meal and keeping an eye on the baby at the same

time. The telephone rings and this means your troubles are beginning. While you are on the phone, the baby

pulls the table-cloth off the table, destroying your half prepared meal. You hang up hurriedly and attend to

your baby. Meanwhile, the meal gets burnt. As if this were not enough to bring you to tears, your husband

arrives, unexpectedly bringing three guests to dinner.

     Things can go wrong on a number of people on the road. During the rush hour one evening two cars hit

each other and both drivers began to argue. The woman driver behind the two cars happened to be a learner.

She suddenly go into a panic (恐慌) and stopped her car. This made the driver following her stop suddenly.

His wife was sitting beside him holding a large cake. As she was thrown forward, the cake went right through

the window and landed on the road. Seeing a cake flying through the air, a truck-driver had to stop his truck

all of a sudden. The truck was carrying empty beer bottles and hundreds of them slid off the back of the truck

on to the road. This led to yet another angry argument. Meanwhile, the traffic piled up behind. It took the police

nearly an hour to get the traffic on the move again. In the meanwhile, the truck-driver had to sweep up hundreds

of broken bottles. Only two dogs were enjoying themselves from the accident, for they were happily having

what was left of the cake. It was just one of those days!

1. According to the author's opinion, _____. [ ]

A. a small matter may cause great trouble

B. accidents may happen anytime

C. troubles always come in groups

D. anyone may have trouble any day

2. When the telephone rings, _____. [ ]

A. you'd better have your baby a little distant from your table before answering it

B. your trouble is sure to come

C. you'd better just let it ring all the way

D. you should never go to answer it in a hurry

3. What did the police do after the accident? [ ]

A. They helped the driver clean up the road.

B. They helped the drivers to go on with their journey.

C. They tried to stop the people from arguing.

D. They would find out who should be responsible

4. From the story we can see _____. [ ]

A. such accidents are rather common

B. such accidents are rather strange

C. no one can explain why such accidents happen

D. some drivers are too careless

用CH₄催化还原NO_x可以消除氮氧化合物的污染。例如：

①CH₄(g)+4NO₂(g)=4NO(g)+CO₂(g)+2H₂O(g)；△H=－574kJ/mol

②CH₄(g)+4NO(g)=2N₂(g)+CO₂(g)+2H₂O(g)；△H=－1160kJ/mol

下列说法中错误的是（  ）

A．由反应①可推知：CH₄(g)+4NO₂(g)=4NO(g)+CO₂(g)+2H₂O(l)；△H>－574kJ/mol

B．等物质的量的CH₄在反应①、②中转移电子数相同

C．若用标准状况下4.48L CH₄把NO₂还原为N₂（生成的水为气态），放出热量173.4kJ

D．若用标准状况下4.48L CH₄把NO₂还原为N₂，整个过程中转移的电子总数为1.6mol

我国居民在境外租房支付给非居民的房租，如居民为自然人，则应申报在（）项下。

A.旅游-因私旅游收入

B.旅游-公务及商务差旅收入

C.旅游-医疗保健收入

D.旅游-教育、培训收入

More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give (1) instructions, or play messages that are difficult to understand. If you (2) telephone calls, you need to be ready to respond when you get a (3)

The most common machine is the (4) used in residence. If you call a home (5) there is a telephone answering machine (6) you will hear several rings and then a recorded message that (7) says something like this: "Hello. We can’t come to the (8) right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep", (9) is a brief, high-pitched (10) . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11) you, or you can leave a (12) . Some telephone answering machines record for only 20 or 30 seconds after the beep, (13) you must respond quickly.

Some large businesses and government agencies are using telephone answering machines to provide information on (14) about which they receive a large volume of (15) . Generally speaking, using these systems (16) you to have a touch-tone phone ( a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17) a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18) you hear the topic you want to learn about, and then you push the (19) button. Immediately after making your (20) , you will hear a recorded message on the topic.

8（）

A．tone

B．noise

C．voice

D．tune