Anxiety is believed to ______ diabetes by raising levels of the stress hormone cortisol, which regulates insulin and blood-sugar levels.

单项选择题If all the viruses on the planet were to disappear, a global catastrophe would, ______.and the natural ecosystems of the earth would collapse in a spectacular crash under burgeoning populations d insects.

单项选择题If you develop a reputation for being able to keep secrets others will ______ towards you with useful news and gossip.