Ⅰ.语法填空
Thousands of years before the coming of agriculture, people were already making bread. That's the surprising __1__ (conclude) of a new study based on a curious find in northeastern Jordan.
At its most basic, bread is the combination of __2__ (process) grains and water that have been baked, fried, or steamed. The process leaves behind chemical and structural qualities that researchers can use to identify the principal food. And that's just __3__ archaeologists found when they investigated a 14,000yearold site known as Shubayqa 1 in Jordan's Black Desert. The inhabitants, who were huntergatherers, left their home in a hurry, __4__ the contents of their most recent meal still smoldering (焖) in two sunken fireplaces.
With the help of a scanning electron microscope, which __5__ (use) a beam (束) of electrons to return incredibly complicated zoomedin images, the researchers __6__ (identify) 24 pieces of char (炭) that were decidedly breadlike. Though the bread's exact grain remains unknown, __7__ (it) cellular structure resembles grain species.
The find is the __8__ (old) example of bread yet discovered and predates the arrival of agriculture in the region by some 4,000 years. The discovery, __9__ could help researchers better understand how ancient cultures met their nutritional needs, suggests __10__ (know) how to grow grains isn't essential to making bread from them.
