[单选题]In the US,people prefer waiting for a table to sitting with people they don't know．This means a hostess may not seat a small group until a small table is available,even if a large one is．If you are sitting at a table with people you don't know,it is impolite to light up a cigarette without first asking if it will disturb them. At American restaurants and coffee shops you are usually served tap water before you order．You may find the bread and butter is free,and if you order coffee,you may get a free refill. Most cities and towns have no roles about opening and closing times for stores or restaurants,though they usually do make rules for bars．Especially in large cities,stores may be open 24 hours a day． Servings in restaurants are often large,too large for many people．If you can't finish your meal but would like to enjoy the food later,ask your waitress or waiter for a"doggie bag"．It may have a picture of a dog on it,but everybody knows you are taking food for yourself. Supper and dinner are both words for the evening meal．Some people have"Sunday dinner"．This is an especially big noon meal. Tips are not usually added to the check．They are not included in the price of the meal,either．A tip of about 15%is expected and you should leave it on the table when you leave．In some restaurants,a check is brought on a plate and you put your money there．Then the waiter or waitress brings you your change. Sunday dinner is~
A.a dinner in the evening
B.a big noon meal
C.a big meal on Sunday
D.a supper on Sunday

[单选题]In the US,people prefer waiting for a table to sitting with people they don't know．This means a hostess may not seat a small group until a small table is available,even if a large one is．If you are sitting at a table with people you don't know,it is impolite to light up a cigarette without first asking if it will disturb them. At American restaurants and coffee shops you are usually served tap water before you order．You may find the bread and butter is free,and if you order coffee,you may get a free refill. Most cities and towns have no roles about opening and closing times for stores or restaurants,though they usually do make rules for bars．Especially in large cities,stores may be open 24 hours a day． Servings in restaurants are often large,too large for many people．If you can't finish your meal but would like to enjoy the food later,ask your waitress or waiter for a"doggie bag"．It may have a picture of a dog on it,but everybody knows you are taking food for yourself. Supper and dinner are both words for the evening meal．Some people have"Sunday dinner"．This is an especially big noon meal. Tips are not usually added to the check．They are not included in the price of the meal,either．A tip of about 15%is expected and you should leave it on the table when you leave．In some restaurants,a check is brought on a plate and you put your money there．Then the waiter or waitress brings you your change. What do American people always do when servings are too large for them?
A.They take the food home with a doggie bag for their dog
B.They leave the food on the table and go awa
C.They take the food home with a doggie bag and enjoy the food late
D.They ask the waitress or waiter to keep the food for the

[单选题]It's no secret that most of us don't get enough sleep and suffer for it.If you're between the ages of 16 and 64,1 don't get seven to nine hours ofsleep per night,your logical 2,executive function,attention,and mood can be impaired.3,severe sleep deprivation can lead to depression,anxiety,and 4 ofparanoia（妄想症）.In the long run,sleep deprivation is a main 5 to the nsk ofdementia and Alzheimer's disease.6,one group that doesn't need to heed these warnings i.s executives.In our 7 of 35,000 leaders and interviews with 250 more,we found that the more seruor a person's 8 is,the more sleep they get.There are tw0 9 explanations for this.Either senior executives,with the help of_10 and hard-working middle managers,do less and take more time for sleep.Or senior executives have had the 11 and discipline throughout their career to get enough sleep and 12 maintain a high performance level without 13.Our conclusion is that the latter is the 14."Sleep has always been foundational for my performance,"Cees't Hart,president and CEO of Carlsberg Group,shared with us."And 15 to perform in a way that is required by my current job,I need seven hours of sleep,every night.Of course,with 16 travel and work commitments,sometimes this is 17,and when that happens,it comes with a cost.When I sleep less,I perform less."18,our data found that 68%ofnon-executive leaders get five to seven hours of sleep per night.When there are not enough hours in the day,they 19 some from the night.Many leaders stay up late to catch up on email or other tasks.According to our research,this tendency is widespread,20 gender.9选？
A.possible
B.absurd
C.durable
D.apparent