编码HIV复制所需酶类的基因是（）
A.HIV的RNA中含有的env基因
B.HIV的RNA中含有的pol基因
C.HIV的RNA中含有的gag基因
D.HIV的RNA中含有的nef基因
E.HIV的RNA中含有的tat基因
参考答案：B
解析：人类免疫缺陷病毒（HIV）属于逆转录病毒科慢病毒属，其RNA中含有gag、env和pol基因以及6种调控基因（tat、vif、vpr、vpx、nef、rev）。gag基因编码HIV的核心蛋白，pol基因编码HIV复制所需酶类（逆转录酶、整合酶和蛋白酶），env基因编码HIV的包膜蛋白。
 The Aborigines believed that spirits made people, animals and plants, and that these spirits still live in the earth. For Aborigines, no one can own the earth—the earth belongs to the spirits.In 1700, there were many Aboriginal groups with a population of 750,000 all over Australia, and there were probably more than 240 different Aboriginal languages. The groups did not have a leader. Instead, things were decided by the older men in a group. People from different groups often travelled hundreds of miles to meet each other. Aboriginal life changed when an English boat arrived in Australia in 1770. Many Aborigines were killed in the wars that they had with the English. More Europeans came, and they started taking land from the Aborigines. The Europeans also brought new illnesses that killed the Aborigines. The result is that today there are only about 300,000 Aborigines in Australia. 小题1: The Aborigines painted pictures .
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