下列关于do while…loop和do…loop until循环执行循环体次数的描述正确的是（）。

A:do while…loop循环和do…loop until循环至少都执行一次 B:do while…loop循环和do…loop until循环可能都不执行 C:do while…loop循环至少执行一次，do…loop until循环可能不执行 D:do while…loop循环可能不执行，do…loop until循环至少执行一次

Current gym dogma holds that to build muscle size you need to lift heavy weights. (1) , a new study (2) at McMaster University has shown that a similar degree of muscle building can be achieved by using lighter weights. The secret is to pump air (3) you reach muscle fatigue.
The (4) are published in PLoS ONE.
" (5) grunting and straining to lift heavy weights, you can (6) something much lighter but you have to lift it until you can’t lift it (7) ," says Stuart Phillips, associate professor of kinesiology at McMaster University. "We’re convinced that (8) muscle means (9) your muscle to make new muscle proteins, a process in the body that over time (10) into bigger muscles. "
Phillips praised lead author and senior Ph.D. student Nicholas Burd for masterminding the project that showed it’s really not the weight that you lift but the fact that you get muscular fatigue that’s the (11) point in building muscle. The study used light weights that (12) a percentage of what the (13) could lift. The heavier weights were set (14) 90% of a person’s best lift and the light weights at a mere 30%o of what people could lift. "It’s a very light weight," says Phillips noting that the 80% 90% (15) is usually something people can lift from 5～10 times before fatigue sets in. At 30%, Burd reported that subjects could lift that weight at least 24 times (16) they felt fatigue.
"We’re (17) to see where this new paradigm will lead," says Phillips, adding that these new data have (18) significance for gym enthusiasts but more importantly for people with compromised skeletal muscle mass, (19) the elderly, patients with cancer, or those who are (20) from trauma, surgery or even stroke.

A:until B:unless C:if D:but

It is required by law that a husband (has to pay) the debts of his wife (until) formal notice is given (that) he no longer has (to pay her).（　）

A:has to pay B:until C:that D:to pay her

Mr. Smith kept on (studying) Chinese and (use) it (until) he (had mastered) it.（　）

A:studying B:use C:until D:had mastered

A man and his wife had a small bar near a station. The bar often stayed open until after midnight, because people came to drink there while they were waiting for trains.
At two o’clock one morning, one man was still sitting at a table in the small bar. He was asleep. The barman’s wife wanted to go to bed. She looked into the bar several times, and each time the man was still there. Then at last she went to her husband and said to him, "You’ve waken that man six times now, George, but he isn’t drinking anything. Why haven’t you sent him away It is very late."
"Oh, no, I don’t want to send him away, "answered her husband with a smile: "You see, whenever I wake him up, he asks for his bill, and when I bring it to him. He pays it. Then he goes to sleep again./
The bar often stayed open ______.

A:until after 12 o’clock in the evening B:until early next morning C:all day and all night D:until 12 o’clock in the evening

下列关于Do Until-Loop型循环的叙述中，正确的是 ______。

A:先执行循环体，当Until后的表达式成立时继续循环 B:先执行循环体，当Until后的表达式成立时退出循环 C:先进行循环条件的判断，当Until后的表达式成立时继续循环 D:先进行循环条件的判断，当Until后的表达式成立时停止循环

下列关于do while...loop和do...100p until循环执行循环体次数的描述正确的是( )

A:do while...loop循环和do...loop until循环至少都执行一次 B:do while...100p循环和do...100p until循环可能都不执行 C:do while...100p循环至少执行一次，do...100p until循环可能不执行 D:do while...100p循环可能不执行，do...loop until循环至少执行一次

下列关于do while...loop和do...100p until循环执行循环体次数的描述正确的是( )

A:do whil..loop循环和d..loop until循环至少都执行一次 B:do whil..100p循环和d..100p until循环可能都不执行 C:do whil..100p循环至少执行一次，d..100p until循环可能不执行 D:do whil..100p循环可能不执行，d..loop until循环至少执行一次

下列关于Do Until-Loop型循环的叙述中，正确的是 ______。

A:先执行循环体，当Until后的表达式成立时继续循环 B:先执行循环体，当Until后的表达式成立时退出循环 C:先进行循环条件的判断，当Until后的表达式成立时继续循环 D:先进行循环条件的判断，当Until后的表达式成立时停止循环