问题
单项选择题 A1/A2型题
使用EDTA法测定食物中钙时，在一定的条件下用EDTA进行滴定。这里的“一定的条件”是（）。
A.pH12～14
B.pH10～12
C.pH8～10
D.pH4～6
E.pH6.8
答案
参考答案：A
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使用EDTA法测定食物中钙时，在一定的条件下用EDTA进行滴定。这里的“一定的条件”是（）。
A.pH12～14
B.pH10～12
C.pH8～10
D.pH4～6
E.pH6.8
参考答案：A
| 阅读理解。 | |
| |
| 1. All the animals above are _______. | |
[ ] | |
| A. from Africa B. in the northeast C. from China D. in the zoo | |
| 2. Which animal is full of fun? | |
[ ] | |
| A. A monkey. B. A giraffe. C. A tiger. D. An elephant. | |
| 3. Now Mr. and Mrs. King are going to the zoo with their five-year-old son. How much will they pay for the tickets? | |
[ ] | |
| A. One hundred and twenty yuan. B. One hundred and sixty yuan. C. Two hundred yuan. D. Eighty yuan. | |
| 4. Which is the visiting time? | |
[ ] | |
| A. 8:00 a.m. on Monday. B. 5:00 p.m. on Thursday. C. 8:30 a.m. on Saturday D. 7:30 p.m. on Sunday. | |
| 5. We can _______ in the zoo. | |
[ ] | |
| A. throw dirty things B. not go close to the animals C. not laugh D. give food to the animals |