问题
单项选择题
核酸分子中百分比含量相对恒定的元素是
A．碳(C)
B．氢(H)
C．氧(O)
D．氮(N)
E．磷(P)
答案
参考答案：E
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核酸分子中百分比含量相对恒定的元素是
A．碳(C)
B．氢(H)
C．氧(O)
D．氮(N)
E．磷(P)
参考答案：E
| 从方框中选择恰当的句子补全对话。 | |
| Marie: __1__ Tim : Oh, any kind of food is OK. What's the best restaurant in town? Marie: Well, the French Deli is really good. Tim: __2__ Marie : Yes, it's the most expensive restaurant in town. __3__ Tim: Hmm … And what's Nick's Dinner like? Marie: It's cheaper than the French Deli, but the food is kind of boring. Tim: Oh, that s a new place. Marie: __4__ Tim: Is the food good? Marie: Yes, if you like hot curry. Tim: Yeah, I love it! __5__
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