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【单选题】
在容积为1L的固定密闭容器中充入2mol氨气，在一定条件下发生反应：N 2 (g)+3H 2 (g) 2NH 3 (g)，达到平衡时容器内c(N 2 )为0.5mo l/L，若温度和体积不变，按下列物质的量加入起始物质，达平衡时容器内c(N 2 )不能维持0.5mol/L的是A.
1molN 2 和3molH 2
B.
2molNH 3 和1molHe
C.
2molNH 3 、1molN 2 和3molH 2
D.
0.1molNH 3 、0.95molN 2 和2.85molH 2
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举一反三
【单选题】Task II. Listen to 5 short dialogues and choose the best answer.
A.
In a store.
B.
On a plane.
C.
In the hospital.
D.
At the theater.
【简答题】认一认,下面的角是锐角还是钝角?
【单选题】Task II. Listen to 5 short dialogues and choose the best answer.
A.
Vegetables.
B.
Clothes.
C.
Fruit.
D.
Books.
【单选题】II. Choose the best answer. 1. Which of the following is true for “palace”?
A.
/pə'liːs/
B.
/pə'liːs/
C.
/pleɪs/
D.
/'pæl ə s/
【单选题】Task II. Listen to 5 short dialogues and choose the best answer.
A.
She didn’t know the time.
B.
She forgot her class.
C.
She didn’t catch the bus.
D.
The bus was late.
【单选题】II. Choose the best answer to each question below. 1. In old days, ________ .
A.
people often bought two or three pairs of jeans at a time
B.
mobile phones were two or three times more expensive than today
C.
the quality of products was better than today
D.
we didn’t have so much choice when buying things
【单选题】Task II. Listen to 5 short dialogues and choose the best answer.
A.
9:00.
B.
9:50.
C.
8:45.
D.
8:15
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