During the lecture, the speaker occasionally _____ his point by relating his own experiences.

A) a low – spirited state.

B) a worsening state of health.

C) old age.

D) nervous tension

A.has no smell

B.is tasteless

C.has vitamins

D.is flavored

A. 分裂、生长 B. 生长、分化 C. 生长、分裂 D. 分裂、分化

A. finds B. found C. was being found D. will be found

A. gives B. will be given C. was giving D. gave

A. has been broken B. breaks C. broke D. was broken

A. hasn't cleaned B. didn't clean

C. wasn't cleaned D. hasn't been cleaned

A. has been questioned B. is being questioned

C. is questioning D. has questioned

A. had gone B. could have gone C. would go D. went

A.If I realized B. Had I realized

C.Did I have realized that D. As I realized