六級選詞填空模擬練習題附答案

　　英語六級的選詞填空是考生普遍得分率低，需要考生有較紮實的詞彙基礎、良好的閱讀能力。下面小編為大家帶來，供各位考生閱讀練習。

　　六級選詞填空模擬練習題原文

　　It’s a good idea to apply sunscreen before heading to the beach if you don’t want to bum. Butfor marine animals like whales，they don’t have that _1_. Species like sperm whales can spendup to six hours at the ocean’s surface in between dives, _2_ in the sunlight. So how do theyprotect themselves from a serious case of sunburn?

　　It turns out that their bodies have a similar defense _3_ against the sun’s UV radiation aspeople. Blue whales—which have the lightest skin color of the three species—tan during theirsummer stay before _4_ back to their northern feeding grounds. Sperm whales don’t tan. Theycan receive an “overdose” of UV radiation during their hours at the ocean’s surface, and theyhave proteins that _5_ protect their cells from UV damage. This process is _6_ to how humanbodies produce antioxidants in response to molecules that can cause a lot of genetic andcellular damage. And fin whales escape sun damage thanks to their high levels of melanin—adark substance in the skin to protect humans from UV radiation.

　　Older whales and whales with less _7_ of melanin in their skin—like blue whales—had thegreatest level of damage in their mtDNA. Fin whales, which had the greatest amount ofmelanin, had the least amount of mtDNA damage.

　　Now that the ozone layer that shields Earth from UV radiation is gradually _8_, it’s importantto know what the consequences are for whales and dolphins, especially for _9_ or endangeredspecies. Although it’s difficult to tell what causes many of these skin conditions, UV damage isone cause. Even though whales have _10_ defenses to UV radiation, high exposure can stillbe harmful.

　　六級選詞填空模擬練習題選項

　　A*** similar B*** diminishing C*** liability D*** migrating

　　E*** mutual F*** mechanism G*** effectively H*** jerking

　　I*** instantaneously J*** vulnerable K*** content L*** baking

　　M*** inherent N*** perspective O*** option

　　六級選詞填空模擬練習題答案

　　1.[O]空格在指示代詞that之後，應為名詞。that所指與上一句內容有關，指“去沙灘之前先塗上防晒霜”。此處應選擇option,表示海洋動物“沒有那樣的選擇”。mechanism通常用於指事物本身內在的機制，不適宜用於指代“塗防晒霜”，故排除。

　　2.[L]空格所在句子主謂賓結構完整，且空格位於逗號後面，故應為分詞作狀語，說明鯨魚在海面逗留六小時的狀況。結合上文提到的關於“防晒”的內容，可以推斷此處應該說鯨魚每天“暴晒”六小時，故選baking最合適。

　　3.[F]雖然空格前的defense是名詞，但從句賓語部分意思仍未完整，因此空格應該還是名詞，被defense修飾作句子賓語。此處應選mechanism，表明鯨魚自身擁有防晒的“保護機制”。

　　4.[D]空格前的before是介詞，而空格後緊跟表方位的back to...，可見此處應該選用動詞的現在分詞，表明鯨魚在度過了夏天之後的“動向”。動詞庫中的migrating—詞最為恰當，填入文中表示“遷徙到北方去覓食”。

　　5.[G]空格在主語和謂語之間，故應為副詞。本句提到抹香鯨體內的蛋白質可以保護它們不受紫外線的侵害。effectively符合句意，表明這種蛋白質的保護作用很“有效'

　　6.[A]根據空格後面的內容“人體如何產生抗氧化劑以應對造成大量遺傳細胞損傷的分子”可知，本句類比了抹香鯨和人類自身的防護機制，故填人空格的詞應含“類似”的意思，similar符合句意。

　　7.[K]空格在less和介詞of之間，應為名詞。本段主要講面板黑色素***melanin***含量的多少決定mtDNA受損的程度。填入空格的詞應與amount近義，content“含量”符合句意。

　　8.[B]空格在be動詞和副詞gradually之後，推斷此處應為分詞或形容詞，說明現在臭氧層***ozone layer***所處的狀態。通常指負面影響的consequences提示填入空格的詞應為貶義詞，因此選用diminishing， 表明臭氧層正在逐漸變小，保護地球免受紫外線輻射的作用也在減小。

　　9.[J] or提示填入空格的詞可能是形容詞或分詞，與endangered並列;也可能是名詞，與species並列。詞庫中的名詞放入句中，句意不通。形容詞vulnerable符合句意，表示逐漸減小的臭氧層對“脆弱的”物種會產生特別嚴重的影響。

　　10.[M]空格在名詞之前，應為名詞、形容詞或分詞作定語。由上文可知，鯨魚體內有類似防晒霜的保護機制，因此 鯨魚抗紫外線輻射的能力是自身就有的，故此處用inherent最合適。