下列式子正确的是（ ） A．49=±7 B．(-7)2=7 C．-49=7 D．(-7)

蝗虫能适应相对干燥的陆地环境，是因为其体表有防止水分过度蒸发的：

A．外骨骼

B．鳞片

C．甲壳

D．贝壳

脑卒中患者采用诱发主动运动的阶段是（）

A.急性期

B.亚急性期

C.软瘫期

D.痉挛期

E.改善期

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 rule out that already poorly motivated youngsters（年轻人）may watch lots of TV．

Their study measured the TV habits of 26-year-olds between ages 5 and 15． Those with college degrees had watched an average（平均）of less than two hours of TV per weeknight during childhood, compared with an average of more than 2 1/2 hours for those who had no education beyond high school．

In the California study, children with TVs in their rooms but no computer at home scored（得分）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 findings that children shouldn't have TVs in their bedrooms．

小题1:According to the California study, the low-scoring group might

A．have watched a lot of TV

B．not be interested in math

C．be unable to go to college

D．have had computers in their bedrooms小题2:What is the researchers' understanding of the New Zealand study results?

A．Poorly motivated 26-year-old 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小题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．TV sets shouldn't be allowed in children's bedrooms．

D．Further studies on high-achieving students should be done．小题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 Habit

自我效能感

劳动部门的公益性“四保”岗位是指“保洁、保绿、（）、保序”？

A、保安

B、保修