十万火急

十万火急
We have coins of 1 point,2 points,5 points in a bag.A takes 3 coins.B takes 2.Out of the 5 coins,there are only two kinds of value.The value of 3 coins of A is less than that of the coins of B.What's the total number of the coins at most?
A.13             B.15             C.17                D.19
There are only two questions a mathematics test.10 students get both correct answers.25 students get the correct answer to the first question,18 students get the wrong answer to the second question.How many students get neither of the answers?
A.10              B.3                  C.7               D.15
A string of 40 beads is in the order of 8 red ones and 2 black ones.A cricket jumps from the second black bead.Every time it jumps over 6 beads and fall on the next beads.How many times dose the cricket jump to fall on the black beads?
A.3                  B.6                 C.10              D.5
On a line segment,there are six points.Then how many line segments are there on it?
A.21                 B.28               C.36                  D.56
我明天上午就要去考外国语了,这是老师给我的试卷上的题目,5点之前一定要解答出来!十万火急!