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While building a tunnel through the mountain, ________ .
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |
Of all living creatures on earth, insects are the most plentiful. Some 36 are very useful to man, for example, bees, 37 we get honey and wax, and silkworms, which 38 us with silk. Other varieties, 39 , are extremely harmful, and do a great 40 of damage, especially to crops. Locusts （蝗虫） are perhaps the most dangerous of all, 41 they will eat almost any green 42 , and when millions of them 43 on cultivated land（耕地）they soon leave it 44 . In some countries they are the farmer’s 45 enemy. Another nuisance is the common 46 , not only because it 47 us indoors and out - of- doors, but because it spreads diseases.
Scientists have given much time and 48 to the study of insects. It needs the most careful and 49 observation. Thanks 50 their discoveries we now know almost all 51 is to be known about the habits of these hardworking insects, bees and ants, which live in 52 better planned in some ways than our 53 . But the most valuable work has been done in trying to give 54 to men, animals and crops from the 55 which insects cause.
36．A. members B. forms C. qualities D. varieties
37．A. by which B. from which C. of which D. in which
38．A. give B. produce C. offer D. supply
39．A. however B. meanwhile C. therefore D. what's more
40．A. majority B. number C. amount D. quantity
41．A. and B. for C. if D. when
42．A. grass B. field C. fruit D. plant
43．A. settle B. attack C. pass D. cross
44．A. bare B. nothing C. empty D. untouched
45．A. hardest B. greatest C. serious D. wildest
46．A. insect B. creature C. fly D. enemy
47．A. dislikes B. bites C. worries D. hates
48．A. understanding B. ideas C. comprehension D. thought
49．A. serious B. patient C. curious D. long
50．A. for B. of C. to D. with
51．A. that B. which C. there D. what
52．A. societies B. crowds C. teams D. organizations
53．A. world B. nation C. selves D. own
54．A. help B. protection C. living D. defense
55．A. injury B. wound C. sickness D. ruin
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Selecting a suitable tent
1 ．When determining the size of your tent, you should take into account the number of campers as well as the camping equipment necessary for your trip．There should be enough room in the tent for the camping equipment． 2 ．
Importance of food
While camping, you will need enough food to give you enough energy for your outdoor work． 3 ．You should use a two burner stove to do all your cooking．Insist on simple cooking and use vegetables and ready-made food during your trip to reduce cooking time．
Adequate(enough)sleep
4 ．Nights are generally cooler than the days so you need to have enough warm clothes to feel comfortable enough to sleep during the night．When buying a sleeping bag, check that you feel comfortable in it．Extra air mattresses(气垫)may be included in your camping equipment to make your bed more comfortable．
5 ．Keep these camping guidelines in mind and make sure you are fully prepared to enjoy your camping trip．
A．All campers should have adequate sleep during the night．
B．Thus you must have an efficient arrangement(安排)for food preparation．
C．The best camping trips are had by those people who prepare the best．
D．Take healthy food with you to meet energy demands during your trip．
E．The comfort level in a tent determines(决定)the success of a camping trip．
F．The size is the most important thing you should carefully consider when choosing a tent．
G．It will destroy the mood of the entire camping trip if you don’t have a good sleeping bag．
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Laser(激光)is short for Light Amplification by Stimulated Emission of Radiation．Laser light is different from daylight or electric lights．Industry put lasers to work almost immediately after they were invented in nineteen sixty． 1 ．
The first medical operation using a laser took place the year following its invention．Doctors Charles Campbell and Charles Koester used a laser to remove a tumor from a patient's eye at Columbia-Presbyterian Hospital in New York City． 2 ．
Lasers have made measurement an exact science．Astronomers have used lasers to measure the moon's distance from Earth． 3 ．For example, drawing a perfectly level straight line on a construction site is easy using a laser．
4 ．And the jewelry industry uses lasers to write on the surface of the world's hardest substance, diamonds．
Lasers are found in many products used almost everywhere．Over one hundred years ago, writers imagined that beams of light could be powerful weapons．Today, lasers guide missiles and bombs．American defense companies are working on giant laser guns recognizable to science fiction fans everywhere． 5 ．
Scientific American magazine says huge lasers turn only about twenty to thirty percent of the energy they use into a laser beam．The rest is lost as heat．
That has not stopped scientists from working to perfect powerful lasers that, one day, may be able to shoot missiles out of the sky．
A．But weapons were not the first to use it on the list．
B．All lasers have several things in common．
C．Mappers and builders use laser technology every day．
D．But there are technological difficulties．
E．Lasers have also changed the way we communicate．
F．Manufacturers have used lasers for years to cut and join metal parts．
G．Since then, doctors have used lasers to cut and remove tissue safely with little risk of infections．