平面镜所成的像是 ____像，像与物体大小________，左右_________.
虚；相同；相反
In a review of 44 studies, American researchers found that men and women who ate six key foods
daily cut the_____ of heart disease by 76% . [ ]
A. trouble
B. problem
C. risk
D. secret
用人单位应对新职工进行“( )”安全教育。
A．三级B．四新C．特种设备人员D．全面
