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

ED WEQWERQWRQWRQWR A: 1 B: 2 C: 3 D: 4

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

I got 1.bor(-ed, -ing) last time during the lection because the topic was totally not 2. interest(-ed, -ing) for me, it was honestly 3. tir(-ed, -ing) to be there for me.Where do you need an -ed prefix for adjectives here？ A: 1，2 B: 3 C: 4 D: 1

极限[img=103x44]18034a4b3761ed3.png[/img]的极限不存在

ask(ed) A: want(ed) B: pleas(ed) C: carri(ed) D: help(ed)

若在需求曲线上某一点的Ed=3,P=6,则相应的MR为() A: 2 B: 4 C: 18 D: 1

若在d曲线上某一点的Ed=3，P=6，则相应的MR为（ ）。 A: 18 B: 1 C: 2 D: 4

可靠安全系数是指（） A: LD/ED B: ED/LD C: LD/ED D: LD/ED E: ED/LD

Add -ed or -ion to or remove them from the following words to form new words. -ed content ➝ 1)____________ compressed ➝ 2)____________ complicated ➝ 3)______________ -ion identify ➝ 4)_____________ justify ➝ 5)______________ qualify ➝ 6)______________ illustrate ➝ 7)______________ exhibition ➝ 8)______________ extend ➝ 9)______________ interpret ➝ 10)______________ plant ➝ 11)______________ perceive ➝ 12)______________