分析 文章大意:
本文主要介紹的是基因和性狀之間的關系.作為一個人,有一半的基因來自于父親,有一半的基因來自于母親,有的基因是顯性的,比如黑色的頭發(fā)和棕色的眼睛,所以性狀比較常見,有的是隱性的,如藍色的眼睛,性狀比較少見.
解答 31.A,詞義猜測題,文中提到"They passed their traits on to you through genes"父母的traits通過基因遺傳給后代,我們知道,通過基因遺傳的是性狀,所以traits應該是個性、顯著的特點的意思,由此確定選擇A.
32.A,推理判斷題,文中提到"Brown eyes are dominant over blue eyes.Dark hair is more common"控制棕色眼睛性狀的基因是顯性基因,黑發(fā)更為普遍,由此我們可以知道眾人中常見的性狀是黑發(fā),棕色的眼睛,選擇A.
33.B,主旨大意題,文中提到"Genes help to make you who you are"基因使得你成為獨一無二的,并且文章通篇都在介紹基因和性狀之間的關系,由此確定答案為B.
點評 對于閱讀表達題,一定要記得首先通讀全文,了解文章大意,然后再根據(jù)文章關鍵詞,關鍵句,掌握細節(jié)問題,并進行推理判斷,再去回答具體的問題.
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