16.Organic food(有機食品) is very safe and healthy not just for our body but also the environment.It is free from harmful chemicals that may affect us.It also strengthens our immune system(免疫系統(tǒng)).However,compared with conventional food,which is more common,organic food is much more expensive.There are a lot of reasons.Growing organic food takes a lot of effort and money and shops selling organic food are using the popularity of organic food to sell it at a much higher price.
The number of organic crops is smaller than that of conventional crops.The production costs are very high in organic farming.Many farmers don't use herbicides (除草劑)or pesticides (殺蟲劑)so they have to get rid of the weeds and pests in the fields all by hand,which adds to the cost of organic food.
Also,conventional agriculture(農業(yè)) is heavily supported by the government in terms of taxes,while organic farming gets no help from the government at all.What's more,the farmers can't use sewage sludge(下水道污泥) and chemical fertilizers(肥料),which are cheap to buy.
Another reason is that the demand is much higher than the supply.While there are many people who are trying organic food,there are only a limited number of farmers who produce it.The output (產量) of organic food is low while the transport and packaging costs are the same,which lead to its higher price.
Organic farming requires a lot of things that are not needed in conventional farming.But if the demand becomes high enough,the government might one day help organic farming to lessen the costs.

29.Which of the following is the closest in meaning to the underlined word"conventional"in paragraph 1?C
A.Simple  B.Real  C.Usual  D.Similar.
30.We can learn from the passage thatC.
A.organic farmers use more expensive materials.
B.a large number of farmers produce organic food.
C.the government will soon help organic farming.
D.organic farmers also use herbicides or pesticides.
31.What is mainly discused in this passage?B
A.How to grow organic food.
B.The benefits of organic food.
C.Organic food and the environment.
D.Why organic food costs more.

分析 本文是一篇健康環(huán)保類閱讀,屬于說明文,有機食品是非常安全和健康不僅對我們的身體也有害化學物質的環(huán)境是自由的可能影響,這也可以加強我們的免疫系統(tǒng).本文以此展開談論,主要講述了有機農業(yè),以及有機農業(yè)的優(yōu)點.

解答 29.答案:C.詞義猜測題.根據(jù)"However,compared with conventional food,which is more common,organic food is much more expensive."可推測出,句意為"然而,和傳統(tǒng)食物相比,有很多共同點,有機食品更貴".故該詞意為"普通的,傳統(tǒng)的".故選C.
30.答案:C.細節(jié)理解題.根據(jù)"while organic farming gets no help from the government at all"及"But if the demand becomes high enough,the government might one day help organic farming to lessen the costs."可知,政府支持有機農業(yè).故選C.
31.答案:B.主旨大意題.閱讀全文,根據(jù)全文內容可知,本文主要講述了有機農業(yè)以及有機農業(yè)的優(yōu)勢.故選B.

點評 本文是一篇健康環(huán)保類閱讀,題目涉及多道細節(jié)理解題,詞義猜測題,主旨大意題.做題時學生應仔細閱讀原文,把握文章主要內容,聯(lián)系文章上下文內容并結合所給選項含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測.

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