题目

下图是DNA片段的结构图，请据图回答：     (1)图甲表示DNA片段的____________结构，图乙表示DNA片段的            结构。     (2)图中表示碱基对的是1；表示脱氧核苷酸的是：         。(用图中的数字回答) (3)DNA分子的复制发生在                           期，复制具有_________________的特点。  In many English homes people eat four meals a day: breakfast, lunch, tea and dinner(主餐). People have breakfast at any time from seven to nine in the morning. They eat porridge(粥), eggs or bread. English people drink tea or coffee at breakfast.  小题1:Many English people have        meals a day.A．twoB．threeC．fourD．three or four小题2:A dinner can be       .A．breakfast or lunchB．lunch or teaC．lunch or supperD．breakfast or supper小题3:People have breakfast at       .A．any timeB．eightC．oneD．five小题4:People don't have        for their dinner.A．breadB．bananas and orangesC．soupD．meat and fish小题5:Afternoon tea is         .A．a kind of teaB．a mealC．from five to seven in the afternoonD．before dinner