It was the first time Mary such a big opening ceremony．( )A．has attendedB．attendedC．had attendedD．should attend 题目和参考答案——青夏教育精英家教网—

18．Zero gravity looks cool．But what about the thing no one likes to talk about？Yes，that is right：going to bathroom．Zero gravity makes this everyday task quite a challenge．Astronauts have to be toilet-trained all over again．
The Apollo astronauts raised themselves off the seat of their chairs and stuck a clear plastic bag to their back sides with sticky strips．A second astronaut watched closely to be sure no waste matter escaped the seal．（You would not want that stuff floating around the cabin!） When the deed was done，the astronaut cleaned up with a piece of plastic attached to the inside of the bag，removed the bag，dropped a disinfectant pill in with the waste matter，and put the whole thing，sealed，into a special container．
Donald W．Rethke，an engineer for Hamilton Standard Space Systems，developed a more private way to answer nature's call：the space toilet．It is somewhat like the kind of toilet one would find on commercial airplanes---with unique adaptations for zero gravity，of course．For instance，it has thigh bars that keep the astronaut from floating off the seat．
The astronaut （male or female） defecates （排便） in a bag and urinates （排尿） in a hose．Solid and liquid wastes are kept separated because at least 85% of the urine is recycled and，yes，after careful filtration，used for drinking and other purposes．（Water is always in demand in space．） A vacuum sucks the waste materials into the toilet，where the waste is compacted into hamburger-like patties for easy storage．Although not exactly like an earthbound visit to the toilet，it is at the very least much more private than in the early days of space travel．

28．According to the first paragraph，the lack of the gravity can turn something as simple asDinto a major challenge．
A．eating        B．taking baths       C．sleeping        D．answering nature's call
29．How did astronauts use toilet systems in the Apollo days？
   A．None of the waste was separated as it is now．
   B．Solid waste was compressed and stored on board．
   C．The toilet units used water to remove the waste through the system．
   D．The astronauts each used their own private restroom．
30．To ensure the user remains seated，the toilet comes equipped withD
   A．a plastic bag      B．a sticky strip   C．a wide hose       D．a thigh bar
31．What can be inferred from the fact that most of the astronauts'urine is recycled？B
   A．The recycled water tastes better．
   B．Water is limited on the space shuttle．
   C．It is very convenient to get their urine recycled．
   D．Space science includes recycling urine．

15．Mr．Black must be worried about something； you can it from the look on his face．（　　）

A．

react

2．To make my room look nicer，I had itdecorated （装饰） with wallpaper last week．

12．I have been sooccupied（忙于） with work that I haven't had time for social activities．

19．Havingsuffered（遭受） such heavy pollution，it may be too late to clean up the river．

16．He stronglydisagreed （不同意） with what Ann had said．

17．Snakebites affect between 1.2 million and 5 million people each year around the world．Adults，children and pets around the world experience them．They can result in swelling，bleeding or even death．Any snakebite can be dangerous if infection sets in．Some types of snakevenommake the bite area swollen or painful．Others cause bleeding or damage the heart's nerves．Here are some especially dangerous snakes：
    The largest of all poisonous snakes，king cobras can reach 5.5 meters in length．Each king cobra bite contains enough poison to kill an elephant-or 20 people．But these massive snakes usually avoid people．They live throughout India，southern China and Southeast Asia．
    A bite from Australia's inland taipan，the world's most poisonous snake，releases enough venom to kill 100 men．The good news is that people rarely come in contact with this snake，and a treatment for its venom exists．
    Russell's viper lives throughout Asia，including India，southern China，and on the island of Taiwan．It prefers grassy fields but can be found in forests and cities．It bites more people and causes more deaths than any other poisonous snake．
    Though short，the common Indian krait packs a powerful punch in its bite．Most often，it strikes people at night while they are sleeping．Since the bite causes little pain，victims are often not sure that they have been bitten until they begin to experience stomach cramps．Without treatment，symptoms will worsen quickly and can lead to death．
    The black mamba，a native of Africa，is actually olive or grey in color．Only the inside of its mouth is black．When black mambas feel threatened by a human，they make a loud hissing sound to warn the person away．If the warning is ignored，the snake will attack the person repeatedly．And they can attack quickly，moving over the ground at speeds of up to 20 kilometers per hour．
    If a snake bites you，try to get back so it doesn't bite again．And try to identify it if you can do so safely．Remove any jewelry that could constrict the bitten area．And avoid moving the affected limb （四肢） to slow the venom's spread．Most importantly to get antivenin，a medicine that will stop the venom's effects．Even the most dangerous bites can be cured with quick medical treatment．（403 words）
61．How many kinds of dangerous snakes are mentioned in this passage？C
A.3             B.4                C.5                D.6
62．Judging from the context，the underlined word"venom"in Paragraph 1 meansA．
A．poisonous fluid                   B．high speed
C．remarkable size                   D．dangerous behavior
63．What does the passage imply about the inland taipan？D
A．It was once believed to be extinct．
B．Very little is known about its behavior．
C．Some people keep one as a pet．
D．An encounter（遭遇）with it could be deadly．
64．According to the passage，which of the following are you most likely to see in a city？C
A．A king cobra B．An inland taipan C．A Russell's viper D．An Indian krait
65．If you are bitten by a snake，you should NOTB．
A．try to get back to avoid another bite
B．try to move the bitten limb to speed the spread of the venom
C．try to identify the snake if you can do so safely
D．try to get antivenin as soon as possible．

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