民族发展,是以民族自身因素,民族所处的自然因素、社会因素的综合作用下,民族生存和()的质与量的提高。
A.变化
B.演进
C.进化
D.形成
参考答案:D
按要求改写下列各句,每空一词。
1. The bus ride usually takes about 25 minutes. (改为一般疑问句)
______ the bus ride usually ______ about 25 minutes?
2. Jack has to go to see the doctor. ( 对画线部分提问)
______ does Jack ______ to ______?
3. They can make bread. (改为一般疑问句)
______ they ______ bread?
4. Li Lei is ten years old. Lin Tao is twelve years old. (合并为一句)
Li Lei is ______ ______ Lin Tao.
5. Our bikes are not the same as theirs. (改为同义句)
Our bikes are ______ ______ theirs.
对内燃机车进行全面检查修理,恢复机车的基本性能。1993年7月1日起大修期:干线内燃机车延长为80±10Km;调小内燃机车延长为8~10年。大修为段修修程。