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1,Lung cancer, like some other cancers, often doesn’t produce ________ until it is too late and has spread beyond the chest to the brain, liver or bones.
A) trails B) therapies
C) symptoms D) symbols
题目相关单词解释
trail:n. 踪迹,小径,尾;v. 拖,尾随,追踪
therapy:n. 治疗
symptom:n. 病症，症候，征兆，表征
symbol:n. 象征，符号，标志
2,With the increasing unemployment rate, workers who are 50 to 60 years old are usually the first to be ________.
A) laid off B) laid aside
C) laid out D) laid up
题目相关单词解释
lay off:解雇;停止做
lay aside:把...搁置一旁;储存
lay out:安排,布置;摆出,展开
lay up:使卧床不起
3,The physical differences between men and women can be ________ directly to our basic roles as hunters and child-bearers.
A) pursued B) traced
C) switched D) followed
题目相关单词解释
pursue:v.追捕,追求,继续从事
trace:n. 踪迹，痕迹;vt. 跟踪，追踪;追溯,探索;临摹
switch:n. 开关，突然转变;v. 改变，交换
follow:vt. 跟随，追赶，沿着…前进，仿效;vi. 跟随，紧接
4,It is clear that the dog has a much greater ________ of its brain devoted to smell than is the case with humans.
A) composition B) compound
C) percent D) proportion
题目相关单词解释
devote:vt. 将…奉献(给)，致力于
composition: n. 作文,著作,组织
compound:n. 混合物,复合字;a. 复合的,混合的,合成
percent: n. 百分比,百分数
proportion:n. 比例，率，份儿，部分，均衡，调和;vt. 使成比例，使均衡
5,American college students are increasingly ________ with credit card debt and the consequences can be rather serious.
A) boosted B) burdened
C) discharged D) dominated
题目相关单词解释
increasingly:ad. 日益地，愈加地
consequence:n. 结果，后果
boost:n. 推进,支援;v. 推进,提高
burden:n.重负,负荷;重担v.使负重,装载;加重压于,烦扰
discharge:v. & n. 排出，放出，允许…离开，释放，放电
dominate:vt. 支配的，统治，控制，高出于，居高临下;vi. 居支配地位，处于最重要的地位
