– There are 60 students in my class and 45 of them use weibo very often.

– 45? That means about         of your classmates are weibo users, right?

A. half            B. two thirds              C. three quarters

某开发公司与某科研单位，订立了技术开发合同，合同约定，开发经费为10万元，违约金为开发经费的10％，后开发公司因故违约，给科研单位造成1．2万元的实际损失，问开发公司应支付给科研单位（ ）损失费。

A．4万元

B．5万元

C．14万元

D．1．2万元