With the population explosion, scientists will have to ______ new methods of increasing the worldA. lead to B. stick to C. carry out D. come up with单选

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• With the population explosion, scientists will have to ______ new methods of increasing the worldA. lead to B. stick to C. carry out D. come up with单选
• 1.It is not a serious accident; the car needs only some _____ repairs.A.major B.minor C.secondary D.primary2..With the population explosion,scientists will have to ____ new methods of increasing the world’s food supply.A.lead to B.carry out C.come up with D.stick to 3.One of his many faults is that he never ____ anything very long.A.decides on B.sticks to C.goes over D.makes sure4.The airplane arrived one hour behind _____.A.timetable B.plan C.date D.
• 1.It is not a serious accident; the car needs only some _____ repairs.A.major B.minor C.secondary D.primary2..With the population explosion,scientists will have to ____ new methods of increasing the world’s food supply.A.lead to B.carry out C.come up with D.stick to 3.One of his many faults is that he never ____ anything very long.A.decides on B.sticks to C.goes over D.makes sure4.The airplane arrived one hour behind _____.A.timetable B.plan C.date D.
• 错位排列 有N封信和N个信封,每封信都不装在自己信封里的排列种数记作Dn,则 D1=0,D2=1,D3=2,D4=9,D5=44...为什么,是怎么算出来的?
• It is my red eraser.(改为同义句)_____eraser_____ ____.