Crabtree and Ginn to start; Harbaugh wants better questions

The 49ers might have five No. 1 receivers, but they’re only going to start two of them. Coach Jim Harbaugh said Michael Crabtree and Ted Ginn would start tonight against the Vikings. For Crabtree, it will be his first preseason game appearance, and it means Randy Moss will be working off the bench, according to…