【单选题】【消耗次数：1】
形成气孔状构造的原因主要是岩浆在冷凝时（）
①
地表不平
②
岩浆过于黏稠
③
气体或挥发性物质逸出
④
流速太慢
参考答案：
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【多选题】
中药中挥发性成分的性质，以下说法正确的有
①
挥发油为以流动的油状液体，具香味
②
挥发油可随水蒸气蒸馏
③
挥发油具香味和挥发性
④
挥发性成分具还原性，易被氧化
⑤
按化学结构分类可分为萜类、脂肪族及芳香族挥发性成分
随机题目
【单选题】
According to the author, in order to have a good command of English one must ____.
①
employ as many learning strategies as possible
②
expect to gain an easier task
③
exert oneself constantly
④
sustain oneself
【单选题】
Mr. Brown had hardly said a word since supper,___ had his wife.
①
either
②
or
③
nor
④
so
【单选题】
______ bad cold she spent the entire day in bed.
①
As if
②
Even though
③
In addition
④
Due to
【单选题】
Modesty helps one to go forward, ______ conceit makes one lag behind.
①
whenever
②
only if
③
whereas
④
consequently
【单选题】
A pen pal provides good motivation for your writing because he or she ____.
①
lives far away from you
②
knows China a lot so that you can have a lot to talk about
③
also keeps a diary
④
may inform you of many interesting things in his or her culture
【单选题】
As for words which do not often occur in everyday situation, you just need to be able to ____.
①
recognize them
②
nod at them
③
concentrate much on them
④
practice using them constantly
【单选题】
According to the text, which of the following is NOT one of the possible activities for you to practice speaking English at school?
①
To talk to native speakers on campus.
②
To speak English to the waitress in English as you pay for a meal in a restaurant.
③
To rehearse aloud by yourself.
④
To talk with your classmates in English.
【单选题】
The place did not seem to be popular, for it was completely deserted, and in any case _____ to traffic.
①
inaccessible
②
inadequate
③
insignificant
④
incompatible
【单选题】
The head of the museum was _____and let us actually examine the ancient manuscripts.
①
promising
②
agreeing
③
pleasing
④
obliging