Bleeding spots on the skin caused by thrombocytopenia is due to A: Platelets don't stick easily. B: Platelets do not aggregate easily. C: Blood vessels do not constrict easily D: Loss of capillary wall integrity

We depend on metaphors to create vivid images, but we encounter two more major problems: Sustainable metaphors are hard to find and they may __________(选词填空：constrict; articulate) our reader's understanding of what we are trying to express.

Neckties worn by doctors constitute a threat to the health of their patents because _______. A: they constrict the blood supply to the brain, compromising judgment B: formal attire may intimidate patients, interfering with communication C: they are rarely cleaned and often harbor germs D: doctors have notoriously poor taste and select ties that turn off their patients

In patients with thrombocytopenia, spontaneous bleeding spots and<br/>purpura often appear on the skin and mucosa, mainly due to () A: Not easy to form antithrombus<br/>[B].<br/>Blood vessels do not constrict easily B: Failure to maintain the integrity of vascular endothelium C: Blood clot retraction disorder D: Blood clotting disorders

What can we learn from the video A: When you experience the stress, your blood vessels will just constrict B: Stress can only ruin your life. C: The body's response to stress can only be harmful to the body D: People who spend time caring for others showed absolutely no stress-related increase in dying