A large quantity of students subscribe quite a bit of money to charities, _____ the fact that they themselves

don't have that much money. [ ]

A. thanks to

B. in spite of

C. as well as

D. due to

为保证抹灰表面平整，避免出现裂缝、脱落，抹面砂浆常分底、中、面三层抹灰，各层抹灰要求不同。所以用砂浆的成分和稠度也不相同。( )