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( 提交答案时为第 1 题) A)The physics class is very difficult . B)The physics class is not given this tenll . C)The physics class is easier than peoplethink . D)The physics class should be cancelled if possible . 12 .(2) A)He was satisfied with his military service . B)It was the first time he had been abroad . C)He had never been on a warship . D)He had been on the warshiD before . 13 .(3) A)Put ice on her foot . B) See a doctor at once . C)Give her foot a good rest . D) Take the doctor , s advice . 14 .(4) A)They broke down and could go no further . B)They haven't achieved much . C)They have produced a general agreement . D) They haven ’t started vet . 15 .(5) A)The woman is out of shape . B)The woman doesn , t need a new racket . C)The woman also needs new tennis shoes . D)The woman spent too much on her tennis shoes . 16 .(6) A)He should make an apology to Mary . B) He may talk to Mary directlv . C)He should excuse Mary’s behavior . D)He shouldn’t always pull a long face . 17 .(7) A)She didn’t like the style . B)The coat didn't fit her . C)She couldn’t afford it . D) The fabric felt uncomfonable . 18 .(8) A)She has been on the trip herself and enjoyed it . B)She wouldn’t consider going on the trip . C)She thinks the class is too advanced forthe man . D)She thinks there’s a good reason to go on the trip .
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【单选题】下列各组物质性质比较中,正确的是
A.
氢化物沸点:HI>HBr>HCl>HF
B.
离子半径:K + >Cl - >S 2 -
C.
分子稳定性:HF>HCl>HBr>HI
D.
单质熔点:Li<Na<K<Rb
【单选题】下列各物质的性质比较中,正确的是(    )
A.
氢化物沸点:HI>HBr>HCl>HF
B.
原子半径:K>Cl>S
C.
分子稳定性:HF>HCl>HBr>HI
D.
单质熔点:Li<Na<K<Rb
【单选题】下列各物质中,稳定的单质是( )
A.
C(金刚石)
B.
S(1)
C.
Br 2 (1)
D.
Hg(s)
【简答题】连一连: 9x 2 -4y 2 a(a+1) 2 4a 2 -8ab+4b 2 -3a(a+2) -3a 2 -6a 4(a-b) 2 a 3 +2a 2 +a (3x+2y)(3x-2y)
【单选题】人体触电主要有电击和( )两类。
A.
电热
B.
电伤
C.
电休克
D.
电烙印
【单选题】下列各项内容中,排列顺序正确的是(   ) ①固体的热稳定性:Na 2 CO 3 >CaCO 3 >NaHCO 3 ②物质的熔点Li>Na>K ③微粒半径:K + >S 2 - >F - ④单质的密度Na 2Se>H 2 S>H 2 O
A.
①③
B.
②④
C.
①②
D.
③⑤
【单选题】人体触电主要有电击和()两类。
A.
A电热
B.
B电伤
C.
C电休克
D.
D电烙印
【单选题】下列各物质中,稳定的单质是( )
A.
C(金刚石)
B.
S(l)
C.
Br2(l)
D.
Hg(s)
【单选题】下列各组物质的性质比较中,正确的是
A.
氢化物的沸点:HI>HBr>HCl>HF
B.
稳定性:HF>HCl>HBr>HI
C.
离子的还原性:I — >S 2— >Br — >Cl —
D.
单质的熔点:Li<Na<K<Rb
【判断题】网络商务信息收集的要求可概括为8个字,即:及时、准确、适度和经济。()
A.
正确
B.
错误
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