17-2杨氏双缝干涉双镜劳埃镜 一、杨氏双缝干涉实验

till after, from behind, except in We stayed there till after the sunset He picked up the gun from behind the counter The weather has been fine except in the north

1全部倒装( Full Inversion,又称主谓倒装 (Subject-verb Inversion) 例如: Here are some letters for you Down poured the rain Into the coach scrambled the children

1. If you had come earlier, you the famous scientist a could be met b. might meet c would have met d. would meet

Test 1 Directions: Choose from A), B, C and D) the best answer to complete each of the following sentences 1. No one takes him any more, he's become a figure of fun A)earnestly B)seriously

1. Our company decided to the contract because a number of the conditions in it had not been B) refuse C)assume 2. She is a musician than her brother A)much of B)much as C) more of

1. We plan to reach the Pole in mid-July, and by then we for six weeks A)are walking B)have been walking C) will be walki D)will have been walking

1. The shutdown of the machine was due to its B)defective C)deficient D) spoiled

Unit 2 Reading Comprehension Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and

Unit 6 Reading Comprehension Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and