A It works like an oceanic garbage truck. B It is a giant floating boom for collecting garbage. C It may do harn to marine life. D It is designed to break down the garbage in ocean.

A It is full of challenges to get deployed. B It can reduce most plastic in five years. C It has changed to work quiet well. D It maycause unintended environmental problems.

A Marine animals may be caught accidentally. B The system itself may cause environmental problems C It is difficult to capture most of plastic. D Battering waves cannot generate enough power for the system

A Optimistic. B Indifferent. C Skeptical D Sympathetic.

A Taking low-dose aspirin regularly can make old people younger. B Healthy old people should regularly take low-dose aspirin C Daily low-dose aspirin does harm to healthy old people D A daily baby aspirin can reduce the risk of getting cancer.

A People at the age of 85 B People at the age of 80. C People at the age of 75. D People at the age of 65.

A High blood pressure. B High blood sugar. C Colorectal cancer. D Bleeding. E

A An inexpensive medication. B Health care products. C A low-dose aspirin. D Dailyexercise.

A Negative. B Positive. C Neutral. D Unsure.

A Wildlife protection: the importance on issuing a ban on ivory sales B Wildlife protection:the DNA technique helps clone endangered elephant. C Wildlife protection: the challenges of stopping cross country smuggling. D Wildlife protection: DNA helps track down ivory location.