如右图所示DNA分子复制的片段，图中a、b、c、d表示各条脱氧核苷酸链。一般地说，下列各项中正确的是（）
A.a和c的碱基序列互补，b和c的碱基序列相同
B.a链中（A＋C./（G＋T）的比值与d链中同项比值相同
C.a链中（A＋T）/（G＋C）的比值与b链中同项比值相同
D.a链中（G＋T）/（A＋C）的比值与c链中同项比值不同
参考答案：C
| 阅读理解。 | ||||
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| 1. ________ can draw us a lot of pictures. | ||||
| A. Li Hong B. Xie Zhongqing C. Liu Huifang D. Zhao Bi | ||||
| 2. You should telephone ________ for help if your daughter is ill. | ||||
| A. Li Hong B. Xie Zhongqing C. Liu Huifang D. Zhao Bi | ||||
| 3. You should call ________ when you want to take a taxi to New Century Computer Center. | ||||
| A. 13708221822 B. 13704358529 C. 13901367854 D. 13923016363 | ||||
| 4. We can't send fax to the ________ of the four. | ||||
| A. artist B. manager C. doctor D. driver | ||||
| 5. ________ is a businessman. | ||||
| A. Li Hong B. Xie Zhongqing C. Liu Huifang D. Zhao Bi |