10."extraordinary,extra-official,extracurricular,extra-professional,extra-solar"andsomeotherwordscontainthesameaffix“extra”whichmeans____________.

You have to pay a(n)premium for express delivery. A: extra charge B: extra price C: extra tip D: extra bonus

During the first half of the year, minor solar terms are around 8th day of a solar month and major solar terms around 23rd.

What is a solar eclipse?

____ is based on solar calendar.

阴历：solar calendar

If demand is price elastic and price decreases, then A: the extra revenue from the extra units sold is exactly offset by the loss in revenue due to the lower price B: more information is necessary to determine what happens to total revenue C: the extra revenue from the extra units sold is less than the loss in revenue from the lower price D: the extra revenue from the extra units sold exceeds the loss in revenue from the lower price

The Twenty-Four Solar Terms include .

Pluto, the outermost planet of the solar system, ( ) photographically in March 1930. Pluto, the outermost planet of the solar system, ( ) photographically in March 1930.

Providing extra information___________________________