题目内容

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

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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

LHRH-A中文全称为促黄体素释放激素类似物。

A. 对
B. 错

LHRH-A是一种人工合成的九肽激素，分子量约1167。

A. 对
B. 错