题目内容

She said that she _______ in that country since 1953.

A. has worked
B. had worked
C. works
D. worked

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It was unexpected but I could __________, I thought.

A. help out
B. help for
C. help on
D. help off

A lot of tall buildings _______in his hometown in the last three years.

A. have built up
B. built up
C. were built up
D. have been built up

He used to be a tour _________ before he came to China.

A. assistant
B. helper
C. guide
D. director

LHRH-A的功能有哪些？

A. 刺激脑垂体合成LH和FSH
B. 刺激脑垂体释放LH和FSH
C. 刺激排卵
D. 低剂量的LHRH-A，能激发脑垂体合成和释放GtH，促使性腺进一步发育成熟