【題組】4.Why does the author believe that the Mandans were skilled farmers?(A) They developed effective
【題組】6.Which of the following processes does the author imply was done by both men and women?(A) Clea
【題組】8. According to the passage, the Mandans preserved their food by(A)smoking(B)drying(C)freezing.(
【題組】10.Which of the following crops was cultivated primarily by men(A) Corn(B)Squash(C)Sunflower(D)T
【題組】11.Throughout the passage, the author implies that the Mandans(A)planned for the future(B) value
Questions 12-20The elements other than hydrogen and helium exist In such small quantities that it is
【題組】13.According to the passage, helium is(A) the second-most abundant element in the universe(B) di
【題組】17.The creation of helium within stars(A)cannot be measured(B)produces energy(C)produces hydroge
【題組】19.Most of the helium in the universe was formed(A)in interstellar space(B)in a very short time(