题干

有一条多肤链,分子式为CxHyOpNqS,将它彻底水解后,只得到下列四种氨基酸:分析推算可知,水解得到的氨基酸个数为:(   )

A:p—l

B:p+l

C:q+l

D:q—2

上一题 下一题 0.0难度 选择题 更新时间:2019-09-12 06:40:35

答案(点此获取答案解析)

A

同类题3

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Every time you visit Disney World,there's something new to see. What began in 1971 as the Magic Kingdom now includes the high­tech,movie­mad Disney and Animal Kingdom. Each time the park expands,so do your chances to spend money. How can you save?As a family guide to Disney World,I've been to the park more than 25 times with my kids,and I've developed a few money­saving plans.

    ____Even if you're visiting for fewer days,it's a deal(the pass costs$229 for visitors ages 10 and up,$183 for kids ages three to nine and is free for kids under age three).Without the pass,you'll have to pay separately for Pleasure Island and the water parks. A single trip to Blizzard Beach,for example,would cost a family of four $100.

    ____The prices at some of the nicer restaurants,especially those in Epcot's World Showcase,are much lower at noontime than at dinner. It's wise to make reservations before you leave home. Call 407­W­DISNEY.

    ____F or $65,you can get a Magic Kingdom Club Gold Card(call 1­800­56­DISNEY).Card­holders get up to 20 percent off Disney hotel rooms,plus price breaks on character breakfasts,theme park tickets and goods from Disney stores.

    ____Character­theme dinner shows are expensive,costing a family of four about $140,and even a character breakfast,where Mickey or Donald Duck joins you for cakes,can set you back $50.If your budget is tight,try to meet the characters inside the theme parks and at free in­park shows. You can watch the Diamond Horseshoe show,for example,in the Magic Kingdom for no additional cost,while the similarly themed Hoop­Dee­Doo Musical Revue requires expensive tickets.

    ____By then,the kids will really know what they want,and you won't waste money on expensive things.

A.Members can get lots of benefits.

B.Dine out at lunch.

C.Become a Gold Card Member.

D.Don't pay extra to see a character.

E.Buy the five-day All-in-One Hopper Pass (入场券).

F.Don't waste money on any gift­buying.

G.Wait until the end of your trip to buy souvenirs.