为评价某种疗法治疗近视眼的效果,实验组用该种疗法,对照组不用任何治疗措施,这种对照是
A.空白对照
B.标准对照
C.实验对照
D.自身对照
E.相互对照
参考答案:A
在直角坐标平面内,一次函数y=-x+2的图象一定不经过( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限
—I eat ______ vegetables and ______ meat than I did last year.
—That's why you're getting fatter.[ ]
A. fewer; more
B. more; less
C. less; more
D. many; much