搜题请搜索小程序“爱下问搜题”
问题
判断题
刺槐新枝为绿色，具有枝刺。
答案
参考答案：
错
选择题
— Peter, where did you guys go for the summer vacation?
— We _____ busy with our work for months, so we went to the beach to relax ourselves.
A. were
B. have been
C. had been
D. will be
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单项选择题
β肾上腺素受体主要分布在
A．肌
B．肾
C．皮肤
D．脑
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