20xx年高考英語一輪隨堂限時(shí)備考練習(xí)3完形閱讀6新人教版(編輯修改稿)
2025-03-15 03:39 本頁面
【文章內(nèi)容簡介】 us chemical,which occurs naturally in oceans and the Earth’s crust,but also es from man173。made sources,such as pesticides,burning garbage,and the releasing of fossil fuels.Polychlorinated biphenyls (PCBs),a group of chemicals,can also be found in some dangerous man173。made chemicals were used in many industries until 1977,when they were were released or leaked into the air and water and have been transported around the globe.How do mercury and PCBs end up in fish and the food supply？When they are released into the air,they attach themselves to particles settle on the ground and in the water and are eventually eaten by microscopic fish eat the micro173。organisms,and large fish eat the small fish and on up the food chain.Because they can negatively affect your health,the U．S．Environmental Protection Agency advises that kids younger than 15 years old avoid fishes that contain high levels of mercury and include shark,swordfish,king mackerel,and tilefish.There are also many fishes that are good for you,but because of overfishing,some are in danger of being wiped are being fished in the wild so much that they cannot reproduce fast enough to are being farmed in ways that are not environmentally fishes include red snapper,Atlantic salmon,bluefin tuna,and king crab.Despite these problems,there are several fishes that are both healthy and sustainable,such as Alaskan salmon,American catfish,Pacific cod,and several farm173。raised fish and shellfish.1．How do mercury and PCBs e to our food supply?A．Mercury and PCBs?water?fish?particles?food supply.B．Mercury and PCBs?particles?organisms?fish?food supply.C．Mercury and PCBs?particles?fish?organisms?food supply.D．Mercury and PCBs?organisms?ground and water?fish?food supply.答案 B解析 由文章第四段可推知B項(xiàng)正確。2．The underlined word “they” (Paragraph 5) refers to .A．fish B．particlesC．microscopic organisms D．mercury and PCBs答案 D解析 根據(jù)第四段內(nèi)容可知,這里的they指的便是第四段中說的那些化學(xué)物質(zhì)。3．According to the passage which group of fish can be safely eaten by young kids?A．Shellfish；tilefish；Ala
范文總結(jié)相關(guān)推薦
鄂ICP備17016276號(hào)-1