D．They are all from poor families.

B　解析：细节理解题。根据第一段内容可知文中提到的孩子都在环保上做出了贡献。

2．According to the passage, kmad.org________．

A．provides some goods sold online

B．was designed by Adrienne Boukis

C．focuses on the protection of sea creatures

D．inspires kids to raise money for the manatee

A　解析：细节理解题。根据Manatee Minder中的末句可知答案。

3．The underlined word "proceeds" in the passage probably means________．

A．money B．bags

C．goods D．gifts

A　解析：词义猜测题。根据"She sells the bags..."可知艾德丽安·布克斯把卖包得来的部分钱捐给了慈善组织。

4．In Parker's opinion, every kid________．

A．should travel to the North Pole

B．can succeed at an early age

C．should set a great goal

D．can make a difference

D　解析：推理判断题。根据文章末句"All young people have the power to make a change..."可知每个孩子都能为环保做出贡献。

　　You try to enjoy your dinner in a garden, but several mosquitoes fly around you all the time. A minute later, you have a red bite on your leg. As you madly wave your hands, trying to get rid of these pests, you notice that others seem completely undisturbed. Could it be that mosquitoes prefer to bite some people over others? The short answer is yes. The experts have proved that mosquitoes do show blood preferences. But they are not biting for dinner. Female mosquitoes (males do not bite people) need human blood to develop eggs. Obviously, not just anyone's blood will do.

　　People with a high level of steroids(类固醇) or cholesterol(胆固醇) on their skin surface attract mosquitoes. "That doesn't necessarily mean that mosquitoes prey on people with higher overall levels of cholesterol，" Butler explains. These people simply may be more efficient at processing cholesterol, and the byproducts of that remaining on the skin's surface are attractive to mosquitoes.

"Mosquitoes also target people who produce large amounts of certain acids，" explains John Edman, phD, spokesman for the Entomological Society of America. These acids can trigger mosquitoes' sense of smell, attracting them to land on unsuspecting victims.