阅读理解。
Too much TV-watching can harm children's ability to learn and even reduce their chances of getting a
college degree, new studies suggest in the latest effort to examine the effects of television on children.
One of the studies looked at nearly 400 northern California third-graders. Those with TVs in their bedrooms
scored about eight points lower on math and language arts tests than children without bedroom TVs.
A second study, looking at nearly 1000 grown-ups in New Zealand, found lower education levels among
26-year -olds who had watched lots of TV during childhood.But the results don't prove that TV is the cause
and don't ride out that already poorly motivated youngsters (年轻人) may wash lots of TV.
Their study measured the TV habits of 26-year-olds between ages 5 and 15. These with college degrees
had watched average of less than two hours of TV per weeknight during childhood compared with an average
of more than 2 1/2 hours those had no education beyond high school.
In the California study, children with TVs in their rooms but no computer at home scored the lowest while
those with no bedroom TV but who had home computers scored the highest.
While this study does not prove that bedroom TV sets caused the lower scores, it adds to accumulating
findings that children shouldn't have TVs in their bedrooms.
1. According to the Caledonia study, the low-scoring group might _____. [ ]
A. have watched a lot of TV
B. not be interested ted in math
C. is unable to go to college
D. have had computers in their bedrooms
2. What is the researchers' understanding of the New Zealand study results? [ ]
A. Poorly motivated 26-year-olds watch more TV.
B. Habits of TV watching reduce learning interest.
C. TV watching leads to lower education levels of the 15-year-olds.
D. The connection between TV and education levels is difficult to explain
3. What can we learn from the last two paragraphs? [ ]
A. More time should be spent on computers.
B. Children should be forbidden from watching TV.
C. 'IV sets shouldn't be allowed in children's bedrooms.
D. Further studies on high-achieving students should be done.
4. What would be the best title for this text? [ ]
A. Computers or Television
B. Effects of Television on Children
C. Studies on TV and College Education
D. Television and Children's Learning Habits
，求出电热壶的效率。
则：R=
=48.4Ω（1分）
×1kW·h="0.03" kW·h （1分）
=
=900W （1分） 
=83%(1分)