Question

17．Great changes have taken place in American family life because of the（56）development（develop）of science and industry．In the past，when more Americans lived on farms，a typical family（57）had（have）many children．In a farm family，parents and their children often lived （58）withgrandparents．Often，too，uncles and aunts lived nearly．（59）Butwhen industry became more important than agriculture in American life，families became smaller （60）becauseindustry requires workers （61）whoare ready and able to move off the land and to move again whenever necessary．And large families cannot move （62）easily（easy） from place to place as smaller families can．So people tend to have smaller families nowadays．
 In the future，because of industrialization，families will（63）be required（require） to move even more frequently，and will be even smaller．A typical family may remain childless consists of a man and woman only．A small number of families may take childraising as their chief work．At （64）thesame time they may also raise other people's children，（65）leave（leave） those families free to move from place to place．

Answer 1

分析 本文介紹了美國(guó)家庭的巨大變化，農(nóng)業(yè)時(shí)期整個(gè)大家庭住在一起，工業(yè)時(shí)期家庭變得越來(lái)越�。�

解答 56．development考查名詞．根據(jù)句意：由于科學(xué)和工業(yè)的發(fā)展．because of是介詞短語(yǔ)，后跟名詞作賓語(yǔ)，所以用名詞development．
57．had 考查時(shí)態(tài)．根據(jù)時(shí)間狀語(yǔ)in the past在過(guò)去，所以用過(guò)去時(shí)，答案填had．
58．With 考查介詞．根據(jù)句意：父母和孩子常常和祖父母住在一起，live with"和…住在一起"．
 59．But考查連詞．根據(jù)上文是農(nóng)業(yè)的家庭，后文是工業(yè)的家庭，兩者之間是轉(zhuǎn)折關(guān)系，所以用but連接．
60．because 考查連詞．根據(jù)句意：家庭變得小是因?yàn)楣�業(yè)需要工人．because是連詞"因?yàn)?．
61．who 考查定語(yǔ)從句．先行詞是workers，在定語(yǔ)從句中做主語(yǔ)，所以用關(guān)系代詞who引導(dǎo)．
62．easily 考查副詞．根據(jù)句意：大家庭不能輕易地從一個(gè)地方搬到另一個(gè)地方，此處用副詞修飾動(dòng)詞move．所以填easily．
63．be required　考查被動(dòng)語(yǔ)態(tài)．根據(jù)句意：家庭將需要更頻繁地移動(dòng)．family與require之間是被動(dòng)關(guān)系，所以答案填be required．
64．the 考查固定短語(yǔ)．　at the same time是英語(yǔ)的固定搭配"同時(shí)"．
65．leaving 考查非謂語(yǔ)．根據(jù)句意：他們也可能撫養(yǎng)其他人的孩子，讓那些家庭自由地從一個(gè)地方搬到另一個(gè)地方．此處是現(xiàn)在分詞在句中做結(jié)果狀語(yǔ)從句．

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