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听对话，选择最佳答案。 ( )1. A. She is from the USA. B. She is from England. C. She is from France. ( )2. A. On Monday. B. On Friday. C. On Saturday. ( )3. A. She has to look after her baby. B. She has to go swimming. C. She has to do some cooking. ( )4. A. He was at school. B. He was at the party. C. He was at the book shop. ( )5. A. They want to listen to some songs. B. They want to find what's wrong with the radio. C. They want to listen to the weather report.
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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＜K＜Rb ⑤氢化物的沸点：H 2 Se＞H 2 S＞H 2 O
A.
①③
B.
②④
C.
①②
D.
③⑤
【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】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
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