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问题 单项选择题 A1型题

屈光参差O．25D时，在视网膜上成像大小相差O．5％，如难以形成双眼单视则视网膜成像大小相差已超过

A．2．5％

B．5．O％

C．7．5％

D．10．O％

答案

参考答案：B

阅读理解

My name is Jim. My favorite day is October l8th, because it's my birthday. I am very happy on that day. I eat eggs for breakfast. Then my friends come to my home and play with me. We sing and dance. Someone plays the piano and someone plays the guitar. Lunch is very nice. After lunch, my parents take me to see a movie. My favorite movies are comedies and action movies. After supper, my parents, my sister and I watch TV. Then I go to bed at ten thirty. I don't do my homework on that day. I am very tired but happy on my birthday.

小题1: Jim's birthday is           .

A．October 8

B．October 18

C．December 8th

D．December 18th小题2: Jim's favorite movies are             .

A．comedies

B．action movies

C．thrillers

D．A and B小题3: Jim goes to bed at           .

A．10:30

B．10:13

C．10:00

D．3:10小题4: Does Jim do his homework on his birthday?

A．Yes, he does.

B．No, he doesn't.

C．No, he isn't.

D．I don't know.小题5: How is Jim on his birthday?

A．Tired.

B．Happy but not tired.

C．Tired but happy.

D．Happy.
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不定项选择

如图所示为高速摄影机拍摄到的子弹穿过苹果瞬间的照片。该照片经过放大后分析出，在曝光时间内，子弹影像前后错开的距离约为子弹长度的1%~2%。已知子弹飞行速度约为500m/s，因此可估算出这幅照片的曝光时间最接近

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A．10-3 s

B．10-6 s

C．10-9 s

D．10-12 s

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