【简答题】Whales are ______ ____ as mammals ( 哺乳动物 ) . ( classif y)
【单选题】_____ my surprise, when the students saw this film. they all shouted _____ surprise.
【单选题】I saw the students ___ on the chairs in the classroom.
【简答题】Come vengono classificate le monete?
【单选题】有下列结论: (1)命题 总成立,则命题 总成立 (2)设 则 p 是 q 的充分不必要条件 (3)命题:若 ab =0,则 a =0或 b =0,其否命题是假命题。 (4)非零向量 满足 ,则 的夹角为 其中正确的结论有( )
【单选题】Le donne vengono assunte di meno perché
A.
non esiste una legge che le protegga
B.
la legge le protegge troppo
C.
la legge protegge soprattutto gli uomini
【单选题】It is taken as a great contribution made by ______ that languages in the world are classified into different language families according to their genetic relations.
B.
traditional grammarians
【单选题】有下列结论: ①命题p: x∈R,x 2 >0总成立,则命题 p: x∈R,x 2 ≤0总成立; ②设p: ,q:x 2 +x-2>0,则p是q的充分不必要条件; ③命题:若ab=0,则a=0或b=0,其否命题是假命题; ④非零向量 和 满足 ,则 与 的夹角为30°。 其中正确的结论有 [ ]
【单选题】All the students and their class teacher ______ interested in the film they saw yesterday evening. [ ]
【单选题】有下列结论: (1)命题p:?x∈R,x 2 >0总成立,则命题?p:?x∈R,x 2 ≤0总成立. (2)设 p: x x+2 >0,q: x 2 +x-2>0 ,则p是q的充分不必要条件. (3)命题:若ab=0,则a=0或b=0,其否命题是假命题. (4)非零向量 a 和 b 满足 | a |=| b |=| a - b | ,则 a 与 a + b 的夹角为30°. 其中正确的结论有( ...