of a comprehensive ban on nuclear-weapon tests. This question continues to be one of the most timely and urgent tasks in the field of nuclear disarmament. If put into practice, this measure would have a direct effect on curbing the arms race, particularly in its qualitative aspects. In his statement of 14 october 1985, the representative of Mexico, Ambassador Garcia Robles, enumerated the many resolutions whereby the General Assembly has called for the carrying out of this task. It would be appropriate to recall here the appeal of the Secretary-General, Mr. Perez de Cuellar, who, in December 1984, stated before the General Assembly: "I appeal for a renewed effort towards a comprehensive test ban treaty. No single multilateral agreement could have a greater effect on limiting the further refinement of nuclear weapons. A comprehensive test ban treaty is the litmus test of the real willingness to pursue nuclear disarmament. " (A/39/PV .97, p.l22) Unlike the assertion that we heard today from one delegation, we are firmly convinced that the unilateral moratorium on all nuclear test explosions declared by the Soviet Union is a bold and resolute manifestation of good political will. It has furnished most propitious conditions for speeding up the drafting and adoption of a comprehensive nuclear test-ban treaty, should the other nuclear-weapon States follow this positive example . A truly historic opportunity for concluding such a treaty is at hand which must not be missed. ALW/cw A/C.l/40/PV.ll 74-75 (Mr. Kostov, Bulgaria) It has already become known that the united States has no intention of joining in the Soviet moratorium or of agreeing to a comprehensive nuclear test-ban treaty. To justify such obstructionism, it has so far emphasized in particular the argument that a comprehensive test ban cannot be adequately verified. Prevailing expert opinion, however, points otherwise . Recently, authoritative pronouncements 
**Analysis**
The text appears to be discussing a specific issue related to international relations and diplomacy, specifically the topic of nuclear disarmament and the verification of a comprehensive nuclear test-ban treaty. The language used is formal and official, suggesting that it may be a speech or statement from a government representative or international organization. The text also references specific events, dates, and countries, which further suggests that it is a formal or official document.

**Category**
Science and technology, International relations