“吃一堑，长一智”，说的是专业技术人员需要通过（）来提高心理素质。
参考答案：挫折
Marco______his tales though few people at that time believed it to be true.
A．stood up
B．stood by
C．stood on
D．stood to
未被授予专利权的专利申请也可以做广告。（）
