What are sources to generate the topics? () A: Self-generated topics B: Audience- generated topics C: Occasion-generated topics D: Research- generated topics

Electricity generated from hydroelectric dams and wind power is more _______ than fossil fuel generated power.

With a letter to my mother ( ) Mother’s Day, I’m going to take a minute to reflect. A: on the occasion B: on the occasion of C: on occasions D: in the occasion of

着装的TOP原则为（）。 A: time，occasion，place B: time，occasion，plan C: time，occasion，people D: time，opportunity，place

Now and then; from time to time. A: enormous B: work on C: occasion D: on occasion E: in retrospect

In a cell, approx 90% of ROS is generated by the ________.

By dressing-down for an occasion, you express your respect not only for the occasion, but also for the other guests, the surroundings and especially the host or hostess.

Altium Designer中，新建的 PCB文件一般放在( )文件夹内 。 A: Libraries B: Generated C: Generated D: Source Documents

Is an invasion likely to be an occasion when

TPO rules stand for dressing according to ______.? Time, place;and occasion;|Time, place and order;|Time, position and occasion;;|none of the three.