When the author says that we should intensify our efforts in nutrition education among our young people, he means that we ______.
A. should force young people to eat well-balanced meals
B. should tell young people to eat liver, chicken, beef or veal
C. should teach adolescents about nutrition in home economics class
D. should try to change eating habits to get enough iron and other essential nutrients
Husband and wife with a common duty to the country will find themselves ______closer together.
A. been drawn
B. to draw
C. drawn
D. drawing
设α1，α2，…，αm均为n维向量，那么下列结论正确的是( )．
A. 若k1α1+k2α2+…+kmαm=0，则α1，α2，…，αm线性相关
B. 若对任意一组不全为零的数k1，k2，…，km都有k1α1+k2α2+…+kmαm≠0，则α1，α2，…，αm线性无关
C. 若α1，α2，…，αm线性相关，则对任意一组不全为零的数k1，k2，…，km，都有k1α1+k2α2+…+kmαm≠0
D. 若0α1+0α2+…+0αm=0，则α1，α2，…，αm线性无关
氨由肌肉组织通过血液向肝进行转运的过程是
A. 三羧酸循环
B. 鸟氨酸循环
C. 丙氨酸-葡萄糖循环
D. 嘌呤核苷酸循环
E. 蛋氨酸循环
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