the limits of medicine
the life hazards in the U.S.
the barriers to a longer life
the problems in health investment
The mainly idea of this passage is ______ .A. MannersB. HabitsC. TrafficD. Lights
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The main idea of this passage is that students should______.A. learn independentlyB. learn under close guidance of their professorsC. learn cooperativelyD. not learn mainly for high grades
The passage is mainly a discussion of______.A. the adaptations of organisms to their environmentsB. the reasons why organisms have their particular shapes and colorsC. the special way of life of each living thingD. the hows and whys of the structures of organisms
This passage is mainly about ________.A. freedom for teenagers in summer holidaysB. safety for teenagers in summer holidaysC. activities for teenagers in summer holidaysD. troubles for teenagers in summer holidays
The passage is mainly about .A. honour and writersB. identity and signatureC. signature and responsibilityD. anonymity and signature
The passage is mainly developed by _______.A.analyzing causesB.making comparisonsC.examining differencesD.following the time order
10． The passage mainly describes different opinions of -shopping online．
