【单选题】【消耗次数：1】
（）定位在离层，该酶在脱落过程中扮演主要角色。
①
纤维素酶
②
果胶甲酯酶
③
聚半乳糖醛酸酶
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正确
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阅读课文II. My first days in Beijing, 判断下列句子表述内容的正误:The writer (作者) was from a small town.
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阅读课文II.How to Improve Memory, 判断下列句子表述内容的正误:You can watch TV and memorize new words at the same time.
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【多选题】
I shall never forget the days when I first ________________ Beijing.
①
set foot in
②
arrive at
③
arrived at
④
set out
【多选题】
When I got my first sight of the garden, its beauty____________took my breath away.
①
near
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nearly
③
almost
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hardly
【多选题】
The doctor is busy_______________ and cant speak to you.
①
at present
②
at all
③
right now
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at last