Why does Lawrence urge us to be spontaneous? （ ） A: Because people don’t have spontaneous good habits. B: Because what we have lost in modern civilization is the capacity to be spontaneous. C: Because Lawrence is full of expectations and fantasies about society. D: Because society is too dark and there are too few good people.

All spontaneous reactions are exothermic.

Chronic spontaneous urticaria is defined as spontaneous wheal or angioedema that occurs repeatedly for more than 8 weeks and occurs at least twice a week.

All exothermic reactions are spontaneous reaction .

The light emitted by the LED is incoherent light, and its basic principle is . A: spontaneous radiation B: stimulated absorption C: stimulated radiation D: spontaneous absorption

The light emitted by the LED is incoherent light, and its basic principle is . A: stimulated absorption B: spontaneous radiation C: stimulated radiation D: spontaneous radiation

The spontaneous shoaling of tuna is a clear example of natural ______.

4.It can be inferred that spontaneous spending is usually ________.

13. Friendship is spontaneous and to be worked at, both natural and________._

spontaneous means happening or done without being planned.（)