英语四级完形填空模拟题十三(附答案详解)

Today, most countries in the world have canals.
　　Many countries have built canals near the coast, and parallel __1__ the coast.
　　Even in the twentieth century, goods can be moved more cheaply by boat than by any other __2__ of transport.
　　These __3__ make it possible for boats to travel __4__ ports along the coast without being __5__ to the dangers of the open.
　　Some canals, such as the Suez and the Panama, save ships weeks of time by making their __6__ a thousand miles shorter.
　　Other canals permit boats to reach cities that are not __7__ on the coast, still other canals __8__ landsswheresthere is too much water, help to __9__ fields wherethere is not enough water, and __10__ water power for factories and mills.
　　The size of a canal __11__ on the kind of boats going through it.
　　The canal must be wide enough to permit two of the largest boats using it to __12__ each other easily.
　　It must be deep enough to leave about two feet of water __13__ the keel of the largest boat using the canal.
　　When the planet Mars was first __14__ through a telescope, people saw that the round disk of the planet was criss-crossed by a __15__ of strange blue-green lines.
　　These were called“canals” __16__ they looked the same as canals on earth __17__ are viewed from an airplane.
　　However, scientists are now __18__ that the Martian phenomena are really not canals.
　　The photographs __19__ from space-ships have helped us to __20__ the truth about the Martia“canals”.
　　1.A.off B.with
　　C.to D.by
　　2.A.way B.means
　　C.method D.approach
　　3.A.waterways B.waterfronts
　　C.channels D.paths
　　4.A.among B.between
　　C.in D.to
　　5.A.revealed B.exposed
　　C.opened D.shown
　　6.A.trip B.journey
　　C.voyage D.route
　　7.A.lain B.stationed
　　C.set D.located
　　8.A.escape B.drain
　　C.dry D.leak
　　9.A.water B.wet
　　C.soak D.irrigate
　　10.A.furnish B.afford
　　C.offer D.give
　　11.A.focuses B.bases
　　C.depends D.takes
　　12.A.cross B.pass
　　C.move D.advance
　　13.A.down B.below
　　C.beneath D.off
　　14.A.studied B.researched
　　C.surveyed D.observed
　　15.A.few B.number
　　C.deal D.supply
　　16.A.although B.because
　　C.so D.if
　　17.A.that B.where
　　C.when D.as
　　18.A.exact B.definite
　　C.certain D.decisive
　　19.A.held B.taken
　　C.got D.developed
　　20.A.find B.expose
　　C.uncover D.discover