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【简答题】
用所给动词的适当形式填空。 1. They enjoy _____ (dance) and dance for 2 hours every day. 2. We _____ (not do) homework at the weekend. 3. Could you tell me how _____ (get) there on foot? 4. Tom with his brothers _____ (study) at Beijing Sunshine Secondary School. 5. There _____ (be) a book and some pencils on Simon's desk. 6. —Where is father? He is wanted on the phone. —He _____ (wash) his car in the garden. 7. Kitty is good at _____ (swim) 8. Peter is a good boy and always _____ (help) others in need. 9. Where _____ your pet dog _____ (go) just now? He's so dirty. 10. Would you like _____ (play) basketball with us?
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【单选题】脑脊液中的药物浓度总是低于血浆浓度,主要是因为
A.
与血浆蛋白结合药物不易跨膜
B.
药物与脑组织的亲和力弱
C.
脑内PH的影响
D.
血脑屏障的存在
【简答题】(1)当a>0时,a______-a; 当a=0时,a______-a; 当a<0时,a______-a; (2)请仿照(1)的方法,比较a和 1 a 的大小关系.
【简答题】(1)先化简,再求值: ( 3a a+1 - a 2 -1 a+1 )? a 2 -1 a ,其中a= 7 +1(精确到0.01); (2)当b≠0时,比较 b+1 与1的大小.
【简答题】RFID是如何定义的?
【单选题】在夜间,燃烧干燥的引火柴,发出火焰最容易被救援船舶和飞机发现。( )
A.
B.
【简答题】连词成句。 1. What, you, like, would, for, supper (?) ____________________________________________________ 2. you, some, dessert, like, Would (?) ____________________________________________________ 3. is,...
【简答题】已知A=-a-1,B=a 2 +a,C=2a 2 -5a-1 (1)当a≠-1时,请你说明B-A>0; (2)请你比较A与C的大小?并说明理由.
【简答题】(1)当b≠0时,比较1+b与1的大小; (2)先化简,再求值: ( 3a a+1 - a a-1 )  ? a 2 -1 a ,其中a= 7 +1(精确到0.01).
【简答题】已知A=a+2,B=-a 2 +a+1,C=a 2 -5a+2. (1)求A+B; (2)求C-A,当a>2时,比较C与A的大小,写出简单的过程.
【简答题】当a(    )时,a+1大于2。
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