【題目】閱讀下面短文，在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。

What makes the sea tum red and causes thousands of fish to die？As far back as anyone could remember，the blame was placed on the "red tides. " In 1947，scientists finally connected the red tides with a microscopic sea organism（有機(jī)體）【1】（call）the dinoflagellate.

The dinoflagellate is so tiny 【2】 6，000 of these organisms may be contained in 【3】 single drop of water. It stands on the borderline between plant and animal in its clasification. it produces its own food，as plants do. But it moves 【4】（free）and eats other organisms，as animals do.

Dinoflagellates are normally only one of the many kinds of organisms found in plankton. Plankton is the name given to all very small 【5】（form）of sea life. However，when the air and water 【6】（be）calm and warm，dinoflagellates multiply with 【7】（amaze）sped. The surface of the water appears 【8】（cover）with a red carpet.

The dinoflagellates give off a poison. Many fish die. Their bodies are washed up on the beach. Beaches are not fit 【9】 any use. Fish that are not killed may become 【10】（poison）to animals or people who eat them. Commercial fishing comes to a stop.

As dinoflagellates consume all the food and oxygen in an area，they die. After a time，the sea returns to normal. But when conditions are right，the red tide comes again.

【答案】

【1】called

【2】that

【3】a

【4】freely

【5】forms

【6】are

【7】amazing

【8】to be covered

【9】for

【10】poisonous

【解析】

這是一篇說(shuō)明文。主要內(nèi)容是據(jù)科學(xué)家的調(diào)查可知把赤潮與微小的海洋生物叫做腰鞭毛蟲連接在一起，并闡述了這種海洋生物對(duì)海洋產(chǎn)生的影響。

【1】考查非謂語(yǔ)動(dòng)詞。句意：1947年,科學(xué)家最后連接赤潮與微小的海洋生物叫做腰鞭毛蟲。分析句子結(jié)構(gòu)可知，空處填非謂語(yǔ)動(dòng)詞，再根據(jù)句意可知，dinoflagellate和call是被動(dòng)關(guān)系，故填called。

【2】考查狀語(yǔ)從句。句意：這些生物的腰鞭毛蟲是那么小，這些有機(jī)體的6000個(gè)單位可能包含在一滴水里。分析句子結(jié)構(gòu)可知，空處填從屬連詞，再結(jié)合句意可知，so…that…用來(lái)引導(dǎo)狀語(yǔ)從句，意為“如此……以至于”，故填that。

【3】考查冠詞。分析句子結(jié)構(gòu)可知，空處填冠詞，再根據(jù)句意可知，a drop of意為“一滴……”，與題意相符，故填a。

【4】考查副詞。句意：但是它自由移動(dòng)和吃其他生物,就像動(dòng)物一樣。分析句子結(jié)構(gòu)可知，空處填副詞，再根據(jù)句意可知，freely意為“自由地”，與題意相符，故填freely。

【5】考查名詞的數(shù)。根據(jù)空前all可知，all后加名詞復(fù)數(shù)，意為“所有……”，故填forms。

【6】考查主謂一致。句意：然而,當(dāng)空氣和水是平靜和溫暖。分析句子結(jié)構(gòu)可知，空處填時(shí)態(tài)，結(jié)合語(yǔ)境可知，此處用一般現(xiàn)在時(shí)，air和water都有獨(dú)立的含義，且不構(gòu)成成套名詞，故用are。

【7】考查形容詞。句意：鞭毛藻類以驚人的速度繁殖。分析句子結(jié)構(gòu)可知，空處填形容詞，再結(jié)合句意可知，amazing意為“令人驚訝的”符合句意，故填amazing。

【8】考查固定搭配。句意：水面似乎被紅地毯覆蓋著。根據(jù)句意可知，appear to be是固定搭配，意為“似乎好像”，且the surface of the water和cover之間是被動(dòng)關(guān)系，故填to be covered。

【9】考查固定搭配。句意：海灘不適合任何用途。根據(jù)句意可知，be fit for是固定搭配，意為“適合、勝任”，與句意相符，故填for。

【10】考查形容詞。句意：未被殺死的魚可能對(duì)動(dòng)物或食用它們的人有毒。分析句子結(jié)構(gòu)可知，become是系動(dòng)詞，故空處填形容詞，再結(jié)合句意可知，poisonous 意為“有毒的”，故填poisonous。

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