2. Among the dangers of free diving, the most ________ is the brain's frightening tendency to shut down within 15 feet of the surface during the ascent. • A. Comforting • B. Perplexing • C. Predictable • D. Disconcerting • E. Unpredictable
3. Without ________ action, the atmosphere's concentration of greenhouse gases is expected to double from pre-industrial levels by the end of this century. • A. Expeditious • B. Valuable • C. Expendable • D. Crucial • E. Prompt
4. Blood vessels in the skin and extremities constrict, while those in the brain, heart and lungs dilate, ________ blood to the places that count. • A. Delegating • B. Shunting • C. Bleeding • D. Diverting • E. Relegating
5. The researchers called for ________ new efforts to improve existing technologies and develop others like fusion reactors or space-based solar power plants. • A. Deleterious • B. Detrimental • C. Intensive • D. Adverse • E. Exhaustive
6. The envelope, at least in part, is formed at the end cell division by ________ fragments of the endoplasmic reticulum. • A. Amalgamating • B. Dispersing • C. Rescinding • D. Coalescing • E. Disintegrating
7. He belongs to an international panel of experts that works under United Nations ________. • A. Aura • B. Auspices • C. Aeonian • D. Adytum • E. Aegis
8. The crux of his speech was that the issue of climate change remains too complex and ________ to generate the requisite focus. • A. Multifarious • B. Facile • C. Contentious • D. Debatable • E. Homogenous
9. In the party that has ruled the country for 25 years continuously,