问题
单项选择题
胃液的pH值为（），具有较强的酸性。
A.0.9～1.5
B.0.9～1.2
C.0.6～1.5
D.0.6～1.2
答案
参考答案：A
解析：胃液的pH值为0.9～1.5，具有较强的酸性。
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胃液的pH值为（），具有较强的酸性。
A.0.9～1.5
B.0.9～1.2
C.0.6～1.5
D.0.6～1.2
参考答案：A
解析：胃液的pH值为0.9～1.5，具有较强的酸性。
Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 41.______, plant a lot of trees. But this may not be the best way to make your home a 42._____ place. Last week we visited a park in Hebei. We were 43._____ to find most of the trees had been burned. The workers told us that the trees 44._____ soon after they were planted because they weren’t watered well enough. 45._____ workers burned them and cleaned the place for 46._____ trees to be planted this year. 47.______ a card found in one of the dead trees, a student wrote,” I hope this tree will grow up with me to 48.______ the backbone (栋梁) of our country.” The workers said that the survival (存活) of the trees was really more important than 49.______ trees were planted. Some people in Beijing now have a new idea that they can donate (捐赠) some money and let professional (专业人士) plant and 50.______ the trees.
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