单选题A bag contains three green marbles, four blue marbles, and two orange marbles. If a marble is picked at random, what is the probability that an orange marble will NOT be picked?A 1/4B 1/3C 4/11D 1/2E 9/7

If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles?　 (1) The ratio of red to green marbles is 2:3.　 (2) The ratio of green to blue marbles is 6:5.

A jar contains 10 blue, 8 green, and 6 red marbles. Every time a marble is removed from the jar, it is not replaced. What is the probability, to the nearest hundredth, that the second marble chosen is green if the first marble chosen is green?

A student is instructed to arrange four cards in a row on a table. She has six cards to choose from, each of which has a different color: black, red, blue, green, yellow, and brown. If the student follows these instructions but otherwise chooses her cards randomly, what is the probability that her arrangement will be blue, red, yellow, and green, in that order?

Which of the following is the correct pin out for T568B?（）

Which of the following is the correct arrangement of the data pairs in a T568B wire pattern?（）

Each of seven identical cards is numbered on one of its sides with a different integer from 1 to 7. The cards are turned over and then shuffled so that they are not in a predictable order. If two cards are selected at random without replacement, what is the probability that their sum is at least l1?

What is the purpose of the final sentence of the passage?

A jar contains 54 marbles each of which is blue, green, or white. The probability of selecting a blue marble at random from the jar is 1/3, and the probability of selecting a green marble at random is 4/9. How many white marbles does the jar contain?

A jar contains 4 red, 1 green, and 3 yellow marbles. If 2 marbles are drawn from the jar without replacement, what is the probability that both will be yellow?

在列表：c=["black"，"red"，"green"，"yellow"，"orange"，"blue"]中，设定变量j=3，那么运行代码turtle.pencolor（c[j]）后，画笔的颜色将变成黄色。

A bag contains three green marbles, four blue marbles, and two orange marbles. If a marble is picked at random, what is the probability that an orange marble will NOT be picked?

Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads or all will come up tails?

Three coins are tossed at the same time. What is the probability that exactly two heads are face up?

Read the passage carefully to find the answers for Questions 1 to 5. Answer each question in a maximum of 10 words. Remember to write the answers on the Answer Sheet. Questions 1 to 5 are based on the following passage.Children’s Thinking　　One of the most eminent of psychologists, Clark Hull, claimed that the essence of reasoning lies in the putting together of two “behavior segments” never actually performed before, in some novel way, so as to reach a goal.　　Two followers of Clark Hull, Howard and Tracey Kendler, devised a test for children that was explicitly based on Clark Hull’s principles. The children were given the task of learning to operate a machine so as to get a toy. In order to succeed they had to go through a two-stage sequence. The children were trained on each stage separately. The stages consisted merely of pressing the correct one of two buttons to get a marble and of inserting the marble into a small hole to release the toy.　　The Kendlers found that the children could learn the separate bits readily enough. Given the task of getting a marble by pressing the button they could got the marble; given the task of getting a toy when a marble was handed to them, they could use the marble to get the toy. (All they had to do was put it in a hole.) However, they did not for the most part “integrate”, to use the Kendlers’ terminology. They did not press the button to get the marble and then proceed without further help to use the marble to get the toy. Therefore, the Kendlers concluded that they were incapable of deductive reasoning.　　The mystery at first appears to deepen when we learn, from another psychologist, Michael Cole, and his colleagues, that adults in an African culture apparently cannot do the Kendlers’ task either. It lessens, on the other hand, when we learn that a task was devised which was strictly analogous to the Kendlers’ one but much easier for the African males to handle.　　Instead of the button-pressing machine, Cole used a locked box and two differently colored match-boxes, one of which contained a key that would open the box. Notice that there are still two behavior segments— “open the right match-box to get the key” and “use the key to open the box”—so the task seems formally to be the same. But psychologically it is quite different. Now the subject is dealing not with a strange machine but with familiar meaningful objects; and it is clear to him what he is meant to do. It then turns out that the difficulty of “integration” is greatly reduced.　　Recent work by Simon Hewson is of great interest here for it shows that, for young children, too, the difficulty lies not in the inferential processes which the task demands, but in certain perplexing features of the apparatus and the procedure. When these are changed in ways which do not at all affect the inferential nature of the problem, five-year-old children solve the problem as well as college students did in the Kendlers’ own experiments.　　Hewson made two crucial changes. First, he replaced the button-pressing mechanism in the side panels by drawers in these panels which the child could open and shut. This took away the mystery from the first stage of training. Then he helped the child to understand that there was no “magic” about the specific marble which, during the second stage of training, the experimenter handed to him so that he could pop it in the hole and get the reward.　　A child understands nothing, after all, about how a marble put into a hole can open a little door. How is he to know that any other marble of similar size will do just as well? Yet he must assume that if he is to solve the problem. Hewson made the functional equivalence of different marbles clear by playing a “swapping game” with the children.　　The two modifications together produced a jump in success rates from 30 percent to 90 percent for five-year-olds and from 35 percent to 72.5 percent for four-year-olds. For three-year-olds, for reasons that are still in need of clarification, no improvement— rather a slight drop in performance—resulted from the change.　　We may conclude, then, that children experience very real difficulty when faced with the Kendler apparatus; but this difficulty cannot be taken as proof that they are incapable of deductive reasoning.　　Questions:1．Howard and Tracey Kendler trained their subjects _______ in the two stages of their experiment.　　2．What did the Kendlers conclude?　　3．What objects did Cole use to do his experiment?　　4．Who used a machine to measure deductive reasoning that replaced button-pressing with drawer 　　opening?　　5．Hewson’s modifications resulted in a higher success rate for _______ children.