有两对材料、热处理方法、加工精度等级和齿宽均相同的直齿圆柱齿轮，已知：第一对齿轮m=4mm，z1=25，z2=50；第二对

Why does Doree decide to stop visiting her ex-husband？

A.She remembers Mrs. Sands and is able to clear the confusion away from her mind

B.Through saving the boy, she is able to healing her wound and reconstruct her identity as a whole person

C.She misses the visiting hours and has to come back some other time

D.She has to take the boy to the hospital in the ambulance

Why is the mother of the narrator almost cry from joy when seeing the sceneries？

A.Because they remind her of her lost husband

B.Because they are painted by her husband

C.Because they are cheap

D.Because they are pretty

Why does the narrator feel out of place in the college in contrast with Nina？

A.Because she cannot excel in all subjects as Nina does

B.Because Nina is rich

C.Because her outfit is shabby comparing with Nina’s blending-in dress

D.Because her outfit is not the common apparel of college students

Why is the process of the Narrator’s undressing depicted in detail？

A.To show that she enjoys the process

B.To show her inner conflict of accepting or refusing the Nina’s way of life

C.To show her contempt toward Mrs. Winner

D.To show that she is scared of sexual assault

Why does the narrator feel like a simpleton？

A.Because she is from countryside and doesn’t know much about city life

B.Because she has only focused on her study all her life

C.Because she is intimidated by Nina’s sophisticated experience

D.Because she is threatened by Nina’s money

A．Because they are painted by her husband

B．Because they are cheap

C．Because they remind her of her lost husband

D．Because they are pretty

The narrator had finally decided to attend the fraternity party perhaps because ______.

A．she had fallen in love with him at the first sight

B．she changed her mind when the guy had left

C．she felt lucky to win the bet

D．she was able to buy a black miniskirt with the money she won

If her sister died, you would expect the narrator to feel

A．relieved.

B．surprised.

C．confused.

D．guilty.

Why wasn't the young lady wearing her seat-belt？

A．She wasn't able to make it fit her.

B．She wasn't able to fasten it.

C．She was told not to fasten it.

D．It was unnecessary to wear the seat-belt.

Why wasn't the young lady wearing her seat-belt？

A．She wasn't able to make it fit her.

B．She wasn't able to fasten it.

C．She was told not to fasten it.

D．It was unnecessary to wear the seat-belt.