Nowadays, the life of many people in the world is____(affect) by globle warming. For example, greenhouse gas has a bad effect____both people and environment. The earth's surface temperature____(go) up by about 1 degrees centigrade in the past100 years. As a matter of fact, we may feel that we can hardly put up with the extremely hot summer and we can't get accustomed to warm winter. The rise of the earth's surface temperature has made much ____(different) to human health, the existence of creatures ____ the balance of ecosystems. There is no doubt that it is human activities that result____the bad environment. As a ____(consequent), conditions permitting, all countries in the world should try their best ____(improve) our environment. Even if our effect is limited, it will____(eventual) make a great difference if we keep on____(work) together to deal with global warming. Without all people's joint efforts, what would our future be like?

X和Y是原子序数大于4的短周期元素，X^m＋和Y^n－两种离子的核外电子排布相同，下列说法中，正确的是(　　)

海南的荔枝比主产区广东的荔枝提早15～20天上市，在价格上要高出广东5～6倍。出现这种价位差的主要原因是(   )