问两个语法问题..............

 The Rorschach test is gaining new repeat as a diagnostic tool because it takes only one hour to expose behavior and thought preocesses that may be unlikely to emerge in other procedures or weeks of ordinary interviewing.

(c) that might not emerge in other procedures or in weeks of ordinary interviews

答案是c,是因为这里应该用interview吗,还有没其他语法点

There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.

(D)eitherare now economically competitive with conventional sources of heat and power or will be so within a few years

答案是D,不太明白原文里错误在哪?