题目内容

饮水氟化后，仍可使用的氟防龋措施是

A. 氟片
B. 氟滴剂
C. 氟化泡沫
D. 食盐氟化
E. 饮水加氟后，不需再使用任何氟防龋措施

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呼衰最早出现的表现是

A. 紫绀
B. 精神神经症状
C. 心率快，血压下降
D. 呼吸困难
E. 消化道出血

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Why did the author go past Sheftel's？

A. He was on his way to work.
B. He was looking for a present for his niece.
C. He wanted to buy some envelopes.
D. He liked to look in the shop windows.

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Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
Why don't birds get lost on their long flights from one place to another？ Scientists have puzzled over this question for many years. Now they are beginning to fill in the blanks.
Not long ago, experiments showed that birds depend on the sun to guide
The reason why birds don't get lost on long flight ______.

A. has been discovered recently
B. is known by everybody
C. still remains a mystery
D. has been known to scientists for years

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玄参横切面

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饮水氟化后，仍可使用的氟防龋措施是

A. 氟片 B. 氟滴剂 C. 氟化泡沫 D. 食盐氟化 E. 饮水加氟后，不需再使用任何氟防龋措施

呼衰最早出现的表现是

Why did the author go past Sheftel's？

玄参横切面

A. 氟片
B. 氟滴剂
C. 氟化泡沫
D. 食盐氟化
E. 饮水加氟后，不需再使用任何氟防龋措施