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【单选题】
（ 09 肇庆） 10 ． 用 pH 试纸测定溶液 pH 的正确操作是A.
． pH 试纸 直接浸入待测液
B.
． pH 试纸 先用水润湿 再浸入待测液
C.
． pH 试纸浸液后过一会儿观察
D.
． 用玻棒蘸 取待测液 pH 试纸上，马上观察
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举一反三
【单选题】______ National Day, people usually raise our national flag in front of the house.
A.
On
B.
At
C.
In
D.
Of
【简答题】Raise the national flag and play the ______anthem!
【单选题】National parks were established______.
A.
to show respect to former presidents
B.
to raise public awareness about climate change
C.
to preserve areas of natural beauty
D.
to create job opportunities
【单选题】你想告诉妈妈你们星期一升国旗,她要说: A.On Monday we raise our national flag. B. On Tuesday we raise our national flag.
A.
On Monday we raise our national flag.
B.
On Tuesday we raise our national flag.
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