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【单选题】
波长λ= 600 nm 的单色光垂直照射到牛顿环的装置上,第二级明纹与第五级明纹所对应的空气膜厚度之差为:A.
600 nm.
B.
900 nm.
C.
1800 nm.
D.
1200 nm.
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【单选题】Why does the traveler want to take a bus?
A.
The bus tickets are cheaper than the train tickets.
B.
The bus trip is comfortable because it is air-conditioned.
C.
Bus stops at several cities along the way.
D.
The traveler wants to experience another way of traveling.
【简答题】Why does Miss Smith arrange the visit to MIT and Harvard in a single day?
【单选题】Why does Diana take a bus that day?
A.
She is environmentally-concerned.
B.
She wants to save money.
C.
Her car is being repaired in the shop.
D.
She wants to see the man on the bus.
【单选题】Why does Liz leave Harvard University?
A.
She had no money to study there
B.
She liked Columbia Universtiy more than Harvard University .
C.
She wanted to take care of her sick father.
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