1． My mother invited my friends _______with us．
A． have dinner
B． to have dinner
C． has dinner
D． to have to dinner

高档山地住宅小区的外墙装修拟采用聚碳酸酯采光板，其主要性能特点有（）。

A．刚性大、抗冲击
B．透光性好、隔热保温
C．耐候性好、不老化
D．长期允许使用温度为一20～30℃
E．被火燃烤可产生有害气体

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20．A．look at B．look C．look for D．look after

A.
A．look
B.look
C.look
D.look

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