Human beings need to drink for their survival．Water ranks 1 ____on the list of all-time safe fluids．But not all water is as safe as once 2____．Recent tests of water fountains in several U．S．cities show that many fountains give water containing large 3____of lead（Pb），a poisonous metal．A recent study of 900 water fountains in Los Angeles 4____that half of the fountains 5____contained higher amounts of lead than the 6____the experts consider 7____．In other cities 8____results of tests were announced：too much lead in many，though 9____，drinking fountains． Water doesn’t normally contain any lead，but when it passes through pipes，it can 10____． People who drink the water 11____the lead． An adult’s body passes most of the lead12____the body，but children’s 13____retains more than half the lead 14____．This makes children more likely to be affected．Lead can damage the kidneys ，cause 15____and impair learning and memory ．16____four million children in U．S．A．already have high levels of lead in their bodies． Most of this lead comes from 17____polluted with the metal．They can 18____it up from eating dirt or paint chips containing lead．In 19 ____to limit the lead in water fountains，officials recently suggested that fountains 20____to have too much lead be replaced or repaired．And that certainly requires a lot of money．

1．A．high B．highly C．higher D．height
2．A．existed B．thought C．ordered D．were
3．A．amount B．amounts C．number D．numbers
4．A．considered B．revealed C．thought D．learned
5．A．were B．found C．tested D．used

6．A．lead B．test C．study D．amount
7．A．safe B．safely C．as safe D．safety
8．A．same B．similar C．different D．various
9．A．not much B．not a few C．not all D．not some
10．A．be contaminated B．contaminate
C．be contaminating D．have contaminated

11．A．bring in B．bring out C．take in D．take out
12．A．into B．out of C．on D．off
13．A．health B．body C．lead D．organ
14．A．swallowing B．being swallowed C．having swallowed D．swallowed
15．A．hear loss B．hearing loss C．hearing lost D．lost hearing

16．A．As much as B．As many as C．As well as D．As long as
17．A．breathing air B．breathed air C．air breathed D．air breath
18．A．get B．take C．bring D．pick
19．A．a try B．an attempt C．attention D．a way
20．A．able B．have C．used D．found
Answers Key：
（A）1—5 ABBBC 6—10 DABCA 11—15 CBBDB 16—20 BADBD