下列有关立式车床的论述正确的有（）。 A．立式车床主要用于加工大型和重型工件B．立式

The factory manufactures a ______ of products. A. variety B. mixture C. quality D. volume

He continued speaking，regardless ______ my feelings. A. in B. of C. on D. about

If traffic problems are not solved soon，driving in this city ______ impossible. A. become B. becomes C. will become D. has become

The boss asked his secretary to go to a concert and she ______ his invitation with pleasure. A. received B. accepted C. rejected D. refused

This tool machine is capable ______ being improved. A. to B. in C. with D. of

We ______ very close，but things have changed recently. A. used to be B. are used to being C. are used to be D. were used to being

He found it difficult to make himself ______. A. understood B. be understood C. understand D. to understand

It rained hard yesterday， ______ prevented me from going to the park. A. that B. which C. as D. it

He was busily engaged ______ writing letters. A. on B. inC. with D. by

Do remember to ______ the light when you leave the room. A. turn up B. turn on C. turn off D. turn down