关键路线指的是（）。 活动（作业）最多的路线。 活动时间持续最长的路线。 存在时差的作业构成的路线。 成本高的作业构成的路线。
具有非凡的记忆力可以称为天才。
谷物干燥机
在商品经济运行中，价值、价格和供求三者之间的关系是（）。 价格收购求关系影响，围绕价格上下波动。 价格收价值影响，随供求关系变化而变化。 价格由价值决定，反映价值并反映供求关系。 价格由价值决定，反映价值，但不反映供求关系。 价格由价值决定，受供求关系影响并制约供求关系。
Melissa Poe
Melissa Poe was 9 years old when she （31） a campaign for a cleaner environment by writing a letter to the then President Bush. Through her own efforts， her letter was reproduced on over 250 donated billboards （广告牌） （32） the country.
The response to her plea help was so （33） that Poe established Kids For A Cleaner Environment（Kids F.A.C.E.）in 1989. There are now 300，000 （34） of Kids F.A.C. E. worldwide and is the worlds largest youth environmental organization.
Poe has also petitioned the National Park Service to （35） a "Children's Forest" project in every national park. In 1992， she was invited as one of only six children in the world to speak at the Earth Summit in Brazil as part of the Voices of the Future Program. In 1993， she was given a Caring Award for her （36） by the Caring Institute.
Since the organization started， Kids F. A. C. B. members have distributed and planted over 1 million， trees! Ongoing tree-planting projects include the （37） of Kid's Yards-backyard wildlife habitats（栖息地） -and Kid F.A. C. E. is involved in the exciting Earth Odyssey， which is a great way to start helping.
"Starting the club （38） out to be a way to help people get involved with the environment -club members started doing things like recycling， picking up litter and planting trees as well as inviting other kids to join their club."
"We try to tell kids that it's not OK to be lazy，" she explains."You need to start being a responsible， environmentally （39）person now， right away， （40）you become a resource-sucking adult.”
36.（） creation。 across。 implement。 before。 members。 began。 turned。 purpose。 overwhelming。 efforts。 friendly。 professional。
一般说来，阳光和空气不是商品，但在一些国家，新鲜空气也可以装在特别容器中出售，空气之所以成为商品，根本原因是（）
