2. I enjoy going swimming. It is my favorite___.
(A) group
(B) sport
(C) excuse
(D) dream

23. An unknown metal M is electrolyzed. It took 74.1 s for a current of 2.00 A to plate out 0.107 g of the metal from a solution containing M(NO3)3. The metal is therefore identified as________ . (A) aluminum (B)cobalt (C) bismuth (D) lead (E)gallium

24. The atomic mass of 1 H is 1.00782 amu and the mass of a neutron is 1.00866 amu. The binding energy for uranium-235 (atomic mass 235.0439 u) is calculated to be___________ J/nucleon. (A) 1.22 × 10-11 (B)1.22 × 10-12 (C) 1.22 × 10-13 (D) 1.47 × 10-12 (E)1.47 × 10-11

25. When proteins in solution are heated, the hydrogen bonds in proteins may be broken to result in collapsing of protein secondary structures. What will be the effects of the heating process on ∆H and ∆S of the proteins? (A) ∆H and ∆S all will increase. (B)∆H and ∆S all will decrease. (C) ∆H will increase but ∆S will decrease. (D) ∆H will decrease but ∆S will increase (E)Both ∆H and ∆S will not change. 

1. Look at the picture. What is the teacher holding in her hand? (A) A book. (B) An eraser. (C) A map. (D) A ruler.

3. It's ___enough here. I don't think we need a lamp. (A) bright (B) clean (C) quict (D) safe

4. My younger sister likes ___best of all the animals. (A) lions (B) oranges (C) spoons (D) tennis

5. Mr. Thomas gets a lot of cards and flowers from his students on Teacher's Day every year; he is really a ___teacher. (A) careful (B) crazy (C) lonely (D) popular 

6. My grandpa is good at cooking and he always___a big meal for us when we visit him. (A) burns (B) collects (C) prepares (D) welcomes

7. Mr. Green was very angry with his daughter ___she always put her dirty socks on the dining table. (A) although (B) because (D) until (C) but

8. Working all day on the computer makes my eyes really___. (A) bored (B) hard (C) slow (D) tired