In 2005, the national volume I (Hebei, Henan, Anhui, Shanxi and Hainan) of liberal arts mathematics in the college entrance examination is divided into two parts: volume I (multiple choice questions) and volume II (non-multiple choice questions). Notes to Volume 1: This volume is *** 12, with 5 points for each question and 60 points for * * *. Of the four options given in each question, only one meets the requirements of the topic. Reference formula: If events A and B are mutually exclusive, then P(A+B)=P(A)+P(B) If events A and B are independent of each other, then P (A B) = P (A) P (B) If the probability of event A occurring in an experiment is P, then the surface area of probability sphere that happens exactly k times in n independent repeated experiments. Where r represents the radius of the ball and the volume formula of the ball, where r represents the radius of the ball 1, and multiple-choice question 1. Let the straight line L pass through the point (-2,0) and be tangent to the circle x2+y2= 1. Then the slope of l is () a.1b.c.d.2. Let I be a complete set, S 1, S2 and S3 are three nonempty subsets of I, and S 1∪S2∪S3=I, then the following judgment is correct: () 3. If the area of the circular surface obtained by cutting the ball from the plane from the center of the ball 1 is, then the surface area of the ball is () a.8b.8c.4d.44 When the function is known, the extreme value is found. Then a = () a.2b.3c.4d.55 As shown in the figure, in the polyhedron ABCDEF, it is known that ABCD is a square with a side length of 1, delta △ADE and delta △BCF are regular triangles, EF//AB, EF=2. Then the volume of polyhedron is () a.b.c.d.96. Given that a directrix of hyperbola is, then the eccentricity of hyperbola is () a.b.c.d.7. At that time, the minimum value of function is () a.2b.2c.4d.48 The inverse function is () a.b.c.d. In △ABC, it is known that the following four conclusions are given: (1) Tana Cotb = 120.