Which of the following risk factors is most clearly implicated in the development of atherosclerosis and major risk factor? () A: high serum levels of high density lipoprotein (HDL) B: obesity C: sedentary lifestyle D: high total serum cholesterol levels E: Chlamydia pneumonia infection

To promote particular organizational values, and encourage high levels of informal communication, the managers can attempt to lead ________ example.

High rate of unemployment could lead to a sharp rise in ________ (青少年的) crime.

Exposure to high levels of such chemicals can lead to skin problems, such as<br/>skin cancer. A: Contact B: Betrayal C: Exhibition D: Publication

It is clear from the passage that the author advocates ______. A: the natural development of children's intelligence B: early intervention in children's intellectual growth C: providing enough day-care centers for children of working mothers D: depriving poor mothers of the opportunities to raise their children at home