More than 6000 children were expelled from US schools last year for bringing guns and bombs to school, the US Department of Education said on May 8.
The department gave a report to the expulsions(开除) as saying handguns accounted for 58 percent of the 6093 expulsions in 1996~1997,against 7 percent for rifles or shotguns and 35 percent for other types of firearms.
"The report is a clear sign that our nation’s public schools are cracking down on students who bring guns to school," Education Secretary Richard Rile said in a statement. "We need to be tough-minded about keeping guns out of our schools and do everything to keep our children safe. "
In March 1997, an 11 years old boy and 13 years old boy using handguns and rifles shot dead four children and a teacher at a school in Jonesboro, Arkansas. In October, two were killed and seven wounded in a shooting at a Mississippi school. Two months later, a 14 years old boy killed
A. students enjoy shooting
B. students are eager to be soldiers
C. safety is a problem
D. students can make guns
In early 2004 eight tiny sensors were dropped from a plane near a military base in California. After hit ting the ground, the sensors—also known as smart dust sensors organized themselves into a network and quickly detected a fleet of military vehicles on the ground. They determined the direction, speed and size of a series of military vehicles traveling along the road and later transmitted the data to a computer at a nearby base camp.
Smart dust sensors are minicomputers—as small as a grain of rice in some cases—that can monitor and evaluate their physical environment and can relay the information via wireless, communication. They can monitor elements such as temperature, moisture, humidity, pressure, energy use, vibration, light, motion, radiation, gas, and chemicals. These devices will soon have many applications, such as use in emergency rescue.
Software has been developed to run these minicomputers. A key feature of the software is the abili
A. emergency rescue
B. monitoring pollution
C. military operations
D. evaluating the environment
我来回答: