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Hurricanes at first begin traveling from east to west, because that direction is the way the prevailing winds in the tropics blow, but they then veer off toward higher latitudes, in many cases changing direction toward the east before dissipating over the colder, more northerly waters or over land.

A.Hurricanes at first begin traveling from east to west, because that direction is the way the prevailing winds in the tropics blow, but

B.At first, hurricanes travel from east to west, because that is the direction of the prevailing winds in the tropics, but

C.While hurricanes travel from east to west at first, the direction of the prevailing winds blowing in the tropics, and

D.Because hurricanes at first travel from east to west, since it is the direction of the prevailing winds in the tropics,

E.Hurricanes, beginning by traveling from east to west, because this is the direction of the prevailing winds in the tropics,

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答案：

but連接了

兩個并列句，前面一個是主從句，主句是Hurricanes begin traveling...,because引導(dǎo)了原因狀語從句that direction is the way；第二個分句是they veer off, they指代第一個分句的主語Hurricanes。句子讀完，發(fā)現(xiàn)第一個分句的從句部分direction和way的語義重復(fù)，主句部分at first和begin的語義也重復(fù)，因此A選項(xiàng)可以排除。 B選項(xiàng)避免了A的語義重復(fù)問題，結(jié)構(gòu)也正確，that單獨(dú)使用，指代from east to west，而不是要去取代前文提到的一個詞，所以不需要加介詞短語或定語從句限定，單獨(dú)用也是沒問題的。 C選項(xiàng)第一個分句的結(jié)構(gòu)是“while 從句，名詞短語”，是錯誤結(jié)構(gòu)，正確應(yīng)為“while 從句，主句”；另外，兩個分句的連接詞用and替換but無法表達(dá)出風(fēng)向轉(zhuǎn)換的轉(zhuǎn)折語義。 D句子結(jié)構(gòu)為because…, since…, main clause. 如果一個句子中有兩個原因狀語從句要并列，應(yīng)該用and連接起來，句子結(jié)構(gòu)錯。另外，句子從語義上來說，颶風(fēng)最初自東向西吹和后來改變風(fēng)向之間并不是因果關(guān)系，因此邏輯連詞錯。 E選項(xiàng)句子結(jié)構(gòu)為hurricanes, because…, they veer off. 主語hurricanes缺少謂語動詞，句子結(jié)構(gòu)錯。句子的意思是：最初，颶風(fēng)是自東向西吹的，因?yàn)槟鞘菬釒⑿酗L(fēng)的風(fēng)向，但是隨后當(dāng)颶風(fēng)到達(dá)更高緯度地區(qū)的時候，風(fēng)向就改變了，很多情況下會向東吹，到達(dá)更北地區(qū)的寒冷水域或者陸地上空時就消散了。總的來說，這道題判斷清楚每個選項(xiàng)的句子結(jié)構(gòu)，稍微注意語義重復(fù)的問題就可以選對。答案為B