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问题 单项选择题 A型题

呼吸衰竭引起代谢性酸中毒时，不可能出现下列哪种情况（）

A.细胞内K+外移

B.肾小管排K+减少

C.HCO3-降低

D.血Cl-增高

E.血Cl-降低

答案

参考答案：E

选择题

为研究某湖水溶解氧的情况，收集如下表的数据，分析得出以下结论不正确的是（　　）

水深/m水面1357911
水温/℃2322212015106
溶解氧/（mg/100mL）1212119643

A．水越深，水温越低

B．水越深，溶解氧越少

C．水深为5m～9m时，水温变化最小

D．水深为1m～3m时，水温和溶解氧变化不大
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单项选择题

Did you ever have someone’s name on the tip of your tongue and yet you were unable to recall it (1) this happens again, do no (2) to recall it. Do something (3) for a couple of minutes, (4) the name may come into your head. The name is there since you have met (5) person and his name. It (6) has to be dug out. The initial effort to recall (7) the mind for operation, but it is the subconscious (8) that go to work to dig up a (9) memory. Forcing yourself to recall (10) never helps because it doesn’t (11) your memory；it only tightens it. Students find the preparatory method help (12) examinations. They read over the questions (13) trying to answer any of them. (14) they answer first the ones (15) which they are most confident. Meanwhile, deeper mental activities in the subconscious mind are taking (16) ; work is being done on the (17) difficult questions. By the time the easier questions are answered, answers (18) the more difficult ones will usually begin to (19) into consciousness. It is often (20) a question of waiting for recall to come to the memory.

13（）

A.after

B.besides

C.before

D.against
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