【单选题】A product will be internationally traded as long as the pretrade price differential between the trading partners is:
A.
Greater than the cost of transporting it between them
B.
Equal to the cost of transporting it between them
C.
Less than the cost of transporting it between them
【判断题】Each seller of a product is willing to sell as long as the price he or she can receive is greater than the opportunity cost of producing the product.
【单选题】No one can avoid ____ by advertisements.
【单选题】孟德尔以豌豆作为遗传实验材料而获得良好的结果 , 主要是与豌豆的哪些特性有关
A.
豌豆是一种异 花传 粉的植物 , 在自然情况下容易造成子代的变异
B.
豌豆是一种异花 传 粉的植物 ,在自然情况下容易获得杂交品系
C.
豌豆是一种自花 传 粉的植物 ,在自然情况下不容易进行异花 传 粉
D.
豌豆是一种自花 传 粉的植物 , 在自然情况下不容易保存纯种品系
【多选题】No one can avoid being_ by advertisements.
【单选题】现有一些杂种圆粒豌豆和皱粒豌豆,为获得能稳定遗传的圆粒豌豆,最好的方法是
D.
让杂种圆粒豌豆连续自交两代,在未发生性状分离的植株上收获的圆粒
【单选题】下列有关孟德尔选用豌豆作为试验材料的原因中,不正确的是 [ ]
【单选题】孟德尔选用豌豆作为遗传实验材料的理由是( ) 1豌豆是闭花授粉植物; 2豌豆在自然状态下是纯种; 3豌豆花大,易于人工操作; 4各品种间具有一些稳定的、差异较大而又容易区分的性状 5豌豆在自然状态下是杂种
【单选题】What do insurers firmly believe?
A.
No one can avoid any risks.
B.
People don't like to spend their money.
C.
Almost all people trust insurance.
D.
Most people like to help others.