皮皮学，免费搜题
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【单选题】
着色性干皮病的分子基础是A.
缺少特异核酸内切酶，紫外线照射后，损伤 DNA 增加
B.
由于 XP 类基因有缺陷，在接受紫外线后损伤修复过程缺陷引起
C.
利用维生素 A 的酶被紫外线破坏
D.
温度敏感性转移酶失活
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【单选题】5 On his way to the airport,it _______ to him that he had forgotten to take his passport.
A.
happened
B.
occurred
C.
reflected
【判断题】On the way home the author kept on thinking about what would happen to his son at college.
A.
正确
B.
错误
【简答题】完形填空。 Tom’s father 1 . It was Saturday. Tom was on the way to the hospital 2 his father. The hospital was very far, so he 3 take a bus. When he got to the bus stop, there were already 4 people there. ...
【简答题】词形变化 （8分） 小题1:On his way to school, he found an __________ (上年纪的）person lying on the road. 小题2: China has become more and more (强大的）in the world 小题3:If you want to be a good teacher, you should be ___...
【简答题】动物体通过 和体液调节 来 维持体温 的相对 恒定 。
【单选题】某同学在上体育课时进行剧烈运动,此时需要通过一定机制来维持内环境的稳态。下列有关叙述中不正确的是 ( )
A.
肌细胞无氧呼吸产生并释放到血液中的乳酸，由缓冲物质中和以维持酸碱度
B.
产热增多使体温升高，通过神经—体液调节以维持体温稳定
C.
消耗葡萄糖增多使血糖浓度降低，通过增加胰高血糖素的分泌进行调节
D.
大量流汗导致失水过多，通过减少抗利尿激素的分泌进行调节
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