A) trails
B) therapies
C) symptoms
D) symbols
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
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
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
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
第一题：
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
第二题：
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
责任编辑：虫虫
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