单项选择题
Why did the author begin to doubt himself after the first year of his writing career()
A．He wasn't able to produce a single book. B．He hadn't seen a change for the better. C．He wasn't able to have a rest for a whole year D．He found his dream would never come true.
单项选择题 The passage is meant to()
单项选择题 According to the selection, the muscular sense is responsible for()
单项选择题 Intelligent use of the muscles means that()
