在磨损监测中，（）可以提供磨损产物的数量、粒度、形态和成分。 A．油液光谱分析仪B．油

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

The atmosphere consists of an ocean of gases ______ miles high. A. hundreds B. hundreds of C. of hundreds D. of hundreds of

Not only the students but also the old teacher ______ been changed. A. was B. were C. has D. have