background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg

When was Ralph Waldo Emerson born? A: January 4, 1801 B: May 25, 1803 C: August 30, 1806 D: December 31, 1800

1, 4, 27/4( )12/16 27/4 A: 8 B: 63/8 C: 64/9 D: 77/9

Queen Bee

Tom is as busy as a ________, and he works like a ________. A: bear, dog B: bee, dog C: bee, horse D: bear, horse

In 1803 the United States purchased Louisiana from _____.

函数[img=9x23]1803b77bd69cbe1.png[/img]和[img=9x18]1803b77bde57db8.png[/img]定义在[img=15x19]1803b77be68b051.png[/img]上，下列叙述不正确的是 A: 若[img=9x23]1803b77bee4eeff.png[/img]和[img=9x18]1803b77bf681432.png[/img]有界，则[img=31x23]1803b77bfec5c4e.png[/img]有界 B: 若[img=31x23]1803b77bfec5c4e.png[/img]和[img=9x23]1803b77bee4eeff.png[/img]有界，则[img=9x18]1803b77bf681432.png[/img]有界 C: 若[img=9x23]1803b77bee4eeff.png[/img]和[img=9x18]1803b77bf681432.png[/img]有界，则[img=40x23]1803b77c2e4228c.png[/img]有界 D: 若[img=40x23]1803b77c2e4228c.png[/img]和[img=9x23]1803b77bee4eeff.png[/img]有界，则[img=9x18]1803b77bf681432.png[/img]有界

background: url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层（）。

Help! A bee is ____ in my ear!

png的最优值是（） A: -2 B: -6 C: -45/4 D: -7