题目

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空。 There is a big desert our village and Hope Town. If you want to go to Hope Town, there are two (way) for you. One is short but dangerous; the is long but safe. Many people died in order (get) to Hope Town sooner. “We need some trees in the desert,” said old man. But soon all the young trees died out in the hot sun. “Don't (worried). We can use them as our road signs,” said the old man,“Every time we walk along t下列关于变异的叙述中,正确的是( )A.在减数分裂间期,果蝇Ⅱ号染色体上缺失了一个碱基对,这种变异属于染色体变异B.基因突变一定能够改变生物的表现型C.发生在生物体体细胞内的基因突变一般不能传给子代,属于不可遗传的变异D.基因重组是生物变异的重要来源,一般发生在有性生殖的过程中
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