题目内容

It'sniceyoumewithmymaths.

A. for,tohelp
B. for,helping
C. of,tohelp
D. of,helping

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Theteacheraskedme_____forschoolnexttime.

A. notbelate
B. don’tbelate
C. nottobelate
D. notlate

—Canyoutellme_____sende-mail?—Justhitthesendbutton.

A. whatto
B. whyto
C. howto
D. whento

—WhereisMr.Yu,doyouknow?—Well,it'shardtosay.ButIsawhim_____afootballgamejustnow.

A. waswatching
B. watching
C. hadwatched
D. watched

关于H1受体拮抗剂构效关系的叙述,正确的是

A. 光学异构体均显示相同的抗组胺活性
B. 结构中两个芳环处于一个平面时具有最大的抗组胺活性
C. 芳环与叔氮原子距离为0.5~0.6mm
D. 几何异构体均显示相同的抗组胺活性