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

　　1.【答案】C parallel to“與……平行”，固定搭配。

　　2.【答案】B means of transport“交通工具”，固定搭配。

　　3.【答案】A waterways“水道”;waterfronts指城市的濱水區(qū);channels指海峽;paths指小路。

　　4.【答案】B between指在兩個(gè)港口間航行。among指三個(gè)或三個(gè)以上。

　　5.【答案】B expose“使暴露、面臨”后接to;reveal“顯示”;show“展示”;open意為打開。本句意為暴露在危險(xiǎn)面前。

　　6.【答案】C voyage特指水上航行，其他選項(xiàng)均與水無關(guān)。

　　7.【答案】D locate“位于”;stationed“住扎于”;set“放置于”。lie則不用被動(dòng)式。

　　8.【答案】B drain指排掉(過多的水);其他選項(xiàng)不符合題意。

　　9.【答案】D irrigate指灌溉;soak浸泡，及其他選項(xiàng)不符合題意。

　　10.【答案】A 與介詞for搭配的只有furnish。

　　11.【答案】C depend on“取決于”;base on“把……基于”;take on“承擔(dān)”;focus on為集中注意力。

　　12.【答案】B 本句的意思是“運(yùn)河必須有能夠允許兩條最大的船通過的寬度”。只有pass“通過“符合句意。Cross“穿過、橫跨”與句意不符。

　　13.【答案】C beneath指在……以下，表示位置;down指向下，表方向;below用于抽象概念;off表示距離。

　　14.【答案】D 表示“用……觀測”，要用observe;study、research指系統(tǒng)研究;survey指調(diào)查、檢查。

　　15.【答案】B a few of是一些的意思，修飾可數(shù)名詞;a deal of不能修飾可數(shù)名詞;a number of指大量的;無a supply of的用法。

　　16.【答案】B 根據(jù)句意，這里要用表原因的連詞來引導(dǎo)一個(gè)狀語從句。

　　17.【答案】A 此處用that指代canals。

　　18.【答案】C 在四個(gè)選項(xiàng)中，只有certain有確信的意思。exact和definite的主語應(yīng)為事物，decisive不符合句意。

　　19.【答案】B take photographs是固定搭配，意為拍照。

　　20.【答案】D discover指發(fā)現(xiàn)抽象的事物;find指發(fā)現(xiàn)實(shí)物;expose指暴露;uncover指揭開。后兩詞不符合句意。